Study Materials  

C प्रोग्रामिंग एक व्यापक और बुनियादी प्रोग्रामिंग भाषा है जिसे 1970 के दशक में डेनिस रिची द्वारा विकसित किया गया था। यह भाषा सिस्टम प्रोग्रामिंग, जैसे ऑपरेटिंग सिस्टम और एम्बेडेड सिस्टम डेवलपमेंट, के लिए बहुत उपयोगी है। C प्रोग्रामिंग को समझने के लिए निम्नलिखित बुनियादी जानकारी महत्वपूर्ण है:

1. C प्रोग्राम की संरचना

C प्रोग्राम आमतौर पर निम्नलिखित हिस्सों में विभाजित होता है:

• Header Files: प्रोग्राम की शुरुआत में #include के माध्यम से लाइब्रेरी फाइलें जोड़ी जाती हैं, जैसे #include <stdio.h>।

• Main Function: main() फंक्शन प्रोग्राम का एंट्री पॉइंट होता है।

• Statements और Code Blocks: { } के अंदर सभी निर्देश लिखे जाते हैं।

उदाहरण:

#include <stdio.h>

int main() {

    printf("Hello, World!\n");

    return 0;

}

2. डेटा टाइप्स

C में विभिन्न प्रकार के डेटा टाइप्स हैं:

• int: पूर्णांक (integer) जैसे 10, -5

• float: दशमलव संख्या जैसे 3.14

• char: एकल अक्षर जैसे 'A'

• double: उच्च परिशुद्धता वाली दशमलव संख्या

उदाहरण:

int a = 10;

float b = 3.14;

char c = 'A';

3. वेरिएबल्स और कॉन्स्टेंट्स

• वेरिएबल्स: डेटा को स्टोर करने के लिए उपयोग किए जाते हैं। उदाहरण: int age = 25;

• कॉन्स्टेंट्स: अपरिवर्तनीय मान। उदाहरण: const float PI = 3.14;

4. ऑपरेटर और अभिव्यक्तियाँ

C में विभिन्न प्रकार के ऑपरेटर उपलब्ध हैं:

• Arithmetic Operators: +, -, *, /, %

• Relational Operators: ==, !=, <, >, <=, >=

• Logical Operators: &&, ||, !

उदाहरण:

int a = 10, b = 5;

int sum = a + b; // sum = 15

5. Control Statements

C में प्रोग्राम के प्रवाह को नियंत्रित करने के लिए विभिन्न स्टेटमेंट्स हैं:

• if-else: निर्णय लेने के लिए।

• switch: कई विकल्पों में से चुनने के लिए।

• loops: जैसे for, while, do-while, पुनरावृत्ति के लिए।

उदाहरण (if-else):

int num = 10;

if (num > 0) {

    printf("Positive number");

} else {

    printf("Negative number");

}

6. फंक्शन (Functions)

• प्रोग्राम को छोटे हिस्सों में विभाजित करने के लिए फंक्शन्स का उपयोग किया जाता है।

• उपयोगकर्ता-परिभाषित और प्री-डिफाइंड फंक्शन्स होते हैं।

उदाहरण:

int add(int a, int b) {

    return a + b;

}

int main() {

    int result = add(5, 3);

    printf("Sum: %d", result);

    return 0;

}

7. Arrays और Pointers

• Arrays: समान प्रकार के डेटा का संग्रह। उदाहरण: int arr[5];

• Pointers: मेमोरी एड्रेस को स्टोर करने के लिए उपयोगी। उदाहरण: int *ptr;

उदाहरण (Pointers):

int a = 10;

int *ptr = &a;

printf("Value of a: %d", *ptr);

8. फाइल हैंडलिंग

C में डेटा को फाइल्स में स्टोर और पढ़ने के लिए फाइल हैंडलिंग का उपयोग होता है।

• फाइल खोलना: fopen()

• फाइल पढ़ना: fscanf() या fgets()

• फाइल लिखना: fprintf() या fputs()

• फाइल बंद करना: fclose()

9. मेमोरी प्रबंधन (Memory Management)

• malloc(), calloc(), realloc() और free() का उपयोग डायनामिक मेमोरी आवंटन के लिए किया जाता है।

10. प्रैक्टिस करने के लिए सुझाव

• सिंपल प्रोग्राम्स से शुरुआत करें, जैसे जोड़ना, गुणा करना।

• कंट्रोल स्टेटमेंट और लूप्स का अभ्यास करें।

• प्रोजेक्ट्स जैसे कैलकुलेटर या नंबर गेम बनाएं।

• डेटा स्ट्रक्चर्स (Arrays, Linked Lists) का उपयोग करें।

यदि आपको किसी विशेष विषय पर विस्तार से जानकारी चाहिए, तो बताएं। 😊

1. C Programming Basic Structure

C program ek particular structure ko follow karta hai. Sabse pehle, #include directive hota hai jo libraries ko include karta hai. Phir main() function hota hai jahan se program execution start hota hai.

c

code

#include <stdio.h> // Standard Input/Output library

int main() {   // Main function

    printf("Hello, World!");  // Print statement

    return 0;  // Return value, program successfully ended

}

2. Data Types

C mein different types of data store kiye ja sakte hain, jaise integers, floating-point numbers, characters, etc.

• int: Whole numbers

• float: Decimal numbers

• char: Single characters

• double: Double precision floating-point numbers

c

code

#include <stdio.h>

int main() {

    int a = 5;      // Integer

    float b = 4.5;  // Floating point number

    char c = 'A';   // Character

    double d = 5.55555;  // Double precision floating-point number

    printf("Integer: %d\n", a);

    printf("Float: %.2f\n", b);

    printf("Character: %c\n", c);

    printf("Double: %.5f\n", d);

    return 0;

}

3. Variables

Variables ko hum kisi bhi type ka value store karne ke liye declare karte hain. Jaise:

c

code

int x = 10;   // Declare and initialize variable

float y = 2.5;

4. Control Structures

if-else Statement:

Yeh statement conditions ko check karta hai aur appropriate action leta hai.

c

code

#include <stdio.h>

int main() {

    int num = 5;

    if (num > 0) {

        printf("Positive Number");

    } else {

        printf("Negative Number");

    }

    return 0;

}

switch-case Statement:

Multiple conditions ko handle karne ke liye switch use hota hai.

c

code

#include <stdio.h>

int main() {

    int choice = 2;

    switch (choice) {

        case 1:

            printf("Choice 1\n");

            break;

        case 2:

            printf("Choice 2\n");

            break;

        default:

            printf("Invalid Choice\n");

    }

    return 0;

}

5. Loops

for Loop:

Loop ko use karke hum ek statement ko baar-baar execute karte hain.

c

code

#include <stdio.h>

int main() {

    for (int i = 1; i <= 5; i++) {

        printf("%d ", i);

    }

    return 0;

}

while Loop:

Jab tak condition true ho, tab tak loop chalta rehta hai.

c

code

#include <stdio.h>

int main() {

    int i = 1;

    while (i <= 5) {

        printf("%d ", i);

        i++;

    }

    return 0;

}

do-while Loop:

Pehle code execute hota hai, fir condition check hoti hai.

c

code

#include <stdio.h>

int main() {

    int i = 1;

    do {

        printf("%d ", i);

        i++;

    } while (i <= 5);

    return 0;

}

6. Functions

Functions ka use code ko modular banane ke liye kiya jata hai. Ek function ka definition aur call dono hota hai.

c

code

#include <stdio.h>

int add(int a, int b) {  // Function Definition

    return a + b;

}

int main() {

    int result = add(5, 10);  // Function Call

    printf("Sum = %d", result);

    return 0;

}

7. Arrays

Array ek collection of elements hota hai, jisme elements same data type ke hote hain.

c

code

#include <stdio.h>

int main() {

    int arr[5] = {1, 2, 3, 4, 5};

    for (int i = 0; i < 5; i++) {

        printf("%d ", arr[i]);

    }

    return 0;

}

8. Pointers

Pointers memory locations ko store karte hain.

c

code

#include <stdio.h>

int main() {

    int a = 10;

    int *ptr = &a;  // Pointer to variable a

    printf("Value: %d, Address: %p", *ptr, ptr);

    return 0;

}

9. Structures

Structure ek custom data type hota hai jisme different types ke variables ko store kiya ja sakta hai.

c

code

#include <stdio.h>

struct Student {

    char name[50];

    int age;

    float marks;

};

int main() {

    struct Student s1 = {"John", 20, 85.5};

    printf("Name: %s, Age: %d, Marks: %.2f", s1.name, s1.age, s1.marks);

    return 0;

}

10. File Handling

C mein file operations ko handle karne ke liye fopen(), fprintf(), fclose() jaise functions ka use hota hai.

c

code

#include <stdio.h>

int main() {

    FILE *fptr = fopen("example.txt", "w");  // Open file in write mode

    if (fptr == NULL) {

        printf("Error opening file.");

        return 1;

    }

    fprintf(fptr, "Hello, file handling!");  // Write to file

    fclose(fptr);  // Close the file

    return 0;

}

11. Dynamic Memory Allocation

malloc() aur free() functions ka use karke hum dynamic memory allocate aur deallocate karte hain.

c

code

#include <stdio.h>

#include <stdlib.h>

int main() {

    int *ptr = (int *)malloc(5 * sizeof(int));  // Dynamically allocating memory

    if (ptr == NULL) {

        printf("Memory allocation failed!");

        return 1;

    }

    for (int i = 0; i < 5; i++) {

        ptr[i] = i + 1;

        printf("%d ", ptr[i]);

    }

    free(ptr);  // Freeing memory

    return 0;

}

12. Recursion

Recursion mein ek function apne aap ko call karta hai jab tak base condition nahi milti.

c

code

#include <stdio.h>

int factorial(int n) {

    if (n == 0)

        return 1;

    else

        return n * factorial(n - 1);

}

int main() {

    int result = factorial(5);

    printf("Factorial: %d", result);

    return 0;

}

13. Command Line Arguments

Command line arguments ko handle karne ke liye argc aur argv[] use hota hai.

c

code

#include <stdio.h>

int main(int argc, char *argv[]) {

    for (int i = 0; i < argc; i++) {

        printf("Argument %d: %s\n", i, argv[i]);

    }

    return 0;

}

Unit – I: Introduction to ‘C’ Language

• C Language Fundamentals:

  • History of C: C programming language ko Dennis Ritchie ne 1972 mein develop kiya tha. Yeh structured programming language hai.

  • Character Set: C mein characters ko represent karne ke liye ASCII code ka use hota hai.

  • C Tokens: Yeh smallest unit hoti hai C program ki, jaise keywords, operators, constants, variables, etc.

  • Keywords & Identifiers: Keywords reserved words hote hain, jaise int, if, return, etc. Identifiers user-defined names hote hain, jaise variable names.

  • Variables & Constants: Variables ko values store karne ke liye declare kiya jata hai. Constants wo values hoti hain jo change nahi hoti.

  • Data Types: int, float, char, etc., jo data store karte hain.

Unit – II: Operators

• Types of Operators:

  • Arithmetic Operators: +, -, *, /, %

  • Relational Operators: >, <, >=, <=, ==, !=

  • Logical Operators: &&, ||, !

  • Bitwise Operators: &, |, ^, <<, >>

  • Unary Operators: ++, --, etc.

  • Assignment Operators: =, +=, -=, etc.

• Operator Precedence & Associativity: Operators ki priority kaunse pehle execute hote hain, yeh determine karta hai operator precedence.

Unit – III: Control Structures

• Decision Making (Conditional Statements):

  • if, if-else, nested if-else, switch-case: Yeh structures decision making mein use hote hain.

Example:
c
Code
if (x > 0) {

    printf("Positive");

} else {

    printf("Negative");

}

• 
  

• Loop Control Structures:

  • while, do-while, for loops: Loop structures ko use karke hum same task ko multiple times execute karte hain.

Example (for loop):
c
code
for (int i = 0; i < 5; i++) {

    printf("%d ", i);

}

• 
  

• Other Statements:

  • break, continue, goto, exit ka use loop ko control karne ke liye hota hai.

Unit – IV: Introduction to Problem Solving

• Problem Solving Techniques:

  • Trial & Error, Brainstorming, Divide & Conquer: Yeh methods problems ko solve karne mein madad karte hain.

  • Steps in Problem Solving:

    • Define the problem

    • Analyze the problem

    • Explore solutions

• Algorithms & Flowcharts:

  • Definition: Algorithm ek step-by-step procedure hota hai jo problem ko solve karta hai.

  • Flowchart: Problem-solving process ko graphically represent karne ka tarika.

• Example: Addition of two numbers:

  • Algorithm:

    • Start

    • Read a, b

    • sum = a + b

    • Print sum

    • End

  • Flowchart:

    • Start → Input a, b → sum = a + b → Print sum → End

Unit – V: Simple Arithmetic Problems

• Examples of Simple Problems:

  • Addition, multiplication of integers

  • Checking if a number is positive/negative/even/odd

  • Maximum of two or three numbers

  • Sum of first n numbers

  • Prime number check

  • Factorial of a number

Unit – VI: Functions

• Types of Functions:

  • Basic Functions: Functions jo specific task perform karte hain, like addition, subtraction, etc.

  • Function Declaration & Definition:

    • Declaration tells the compiler about the function name, return type, and parameters.

    • Definition contains the actual body of the function.

Example:
c
code
int add(int a, int b) {

    return a + b;

}

• 
  

• Types of Function Calls:

  • Call by Value: Function ke arguments ka actual value pass hota hai.

  • Call by Reference: Function ko arguments ka address pass hota hai, jo directly modify hote hain.

Recursion: Ek function apne aap ko call karta hai jab tak base condition nahi milti.
Example:
c
Copy code
int factorial(int n) {

    if (n == 0) return 1;

    else return n * factorial(n - 1);

}

Unit – I: Introduction to ‘C’ Language

C Language Fundamentals:

1. History of C:

   • C programming language ko Dennis Ritchie ne 1972 mein develop kiya tha. Yeh structured programming language hai aur C ke features aaj bhi modern languages jaise C++, Java mein use hote hain.

2. Character Set:

   • C language mein characters ko represent karne ke liye ASCII (American Standard Code for Information Interchange) ka use hota hai.

   • Character Set: Letters, digits, punctuation symbols, and special characters.

3. C Tokens:

   • Tokens C program ke smallest units hain. Inhe Keywords, Identifiers, Constants, Strings, Operators etc. ke roop mein divide kiya jata hai.

     • Keywords: Reserved words jo C language ke specific functions ko represent karte hain, jaise int, if, return, etc.

     • Identifiers: User-defined names, jaise variable, function, and array names.

     • Constants: Fixed values jo program ke execution ke dauran change nahi hoti, jaise const int a = 5;.

     • Operators: Mathematical or logical operations perform karne wale symbols, jaise +, -, *, &&, etc.

4. Variables & Constants:

   • Variables memory locations hote hain jahan data store kiya jata hai.

   • Constants wo values hoti hain jo program ke execution ke dauran change nahi hoti.

5. Data Types:

   • Basic Data Types: int, float, char, double, etc.

   • Derived Data Types: Array, Pointers, Structures, Unions.

   • Void Data Type: A type used when no value is returned by a function.

6. Comments:

   • C mein 2 tarah ke comments hote hain:

     • Single-line comment: // comment here

     • Multi-line comment: /* comment here */

Unit – II: Operators

Types of Operators:

1. Arithmetic Operators:

   • + (addition), - (subtraction), * (multiplication), / (division), % (modulus). Example:

c
code
int sum = 5 + 3; // sum = 8

2. 
   

3. Relational Operators:

   • > (greater than), < (less than), == (equal), != (not equal), >= (greater than or equal), <= (less than or equal). Example:

c
code
if (a > b) { printf("a is greater than b"); }

4. 
   

5. Logical Operators:

   • && (AND), || (OR), ! (NOT). Example:

c
code
if (a > 0 && b < 10) { printf("Condition true"); }

6. 
   

7. Bitwise Operators:

   • & (AND), | (OR), ^ (XOR), << (left shift), >> (right shift). Example:

c
code
int result = a & b; // AND operation on a and b

8. 
   

9. Unary Operators:

   • ++ (increment), -- (decrement), sizeof (size of variable). Example:

c
code
int x = 5;

x++;  // x becomes 6

10. 
    

11. Assignment Operators:

    • = (simple assignment), += (addition assignment), -= (subtraction assignment), etc. Example:

c
code
a += 5;  // a = a + 5

Unit – III: Control Structures

Decision Making:

1. if-else:

   • Decision making structure hai jo ek condition check karta hai. Agar condition true hai toh if block execute hota hai, warna else block. Example:

c
code
if (a > b) {

    printf("a is greater");

} else {

    printf("b is greater");

}

2. 
   

3. Nested if-else:

   • Ek if-else ke andar doosra if-else likha jaata hai. Example:

c
code
if (a > b) {

    if (a > c) {

        printf("a is the greatest");

    } else {

        printf("c is the greatest");

    }

}

4. 
   

5. switch-case:

   • Multiple conditions ko check karne ke liye use hota hai. Example:

c
code
switch (day) {

    case 1:

        printf("Sunday");

        break;

    case 2:

        printf("Monday");

        break;

    // other cases

    default:

        printf("Invalid day");

}

Loop Control Structures:

1. for loop:

   • A loop that repeats a block of code for a specific number of times. Example:

c 

code
for (int i = 0; i < 5; i++) {

    printf("%d ", i);  // Output: 0 1 2 3 4

}

2. 
   

3. while loop:

   • A loop that repeats as long as the condition is true. Example:

c
code
int i = 0;

while (i < 5) {

    printf("%d ", i);

    i++;

}

4. 
   

5. do-while loop:

   • Like the while loop, but it executes the block of code at least once, even if the condition is false initially. Example:

c
code
int i = 0;

do {

    printf("%d ", i);

    i++;

} while (i < 5);

6. 
   

7. break, continue, goto:

   • break: Loop ko terminate karta hai.

   • continue: Loop ki current iteration ko skip karta hai aur next iteration pe jump karta hai.

   • goto: Program ko ek specific label pe jump karne ke liye use hota hai.

Unit – IV: Problem Solving

Problem-Solving Techniques:

1. Trial and Error: Problem ko solve karte waqt galat solutions ko test karna aur correct solution tak pahuncha.

2. Brainstorming: Different ideas ko gather karke sabse best solution choose karna.

3. Divide and Conquer: Problem ko chhote chhote parts mein divide karke solve karna.

Algorithms & Flowcharts:

• Algorithm: Step-by-step procedure jo kisi problem ko solve karta hai.

• Flowchart: Graphical representation of an algorithm using different symbols.

Example of an algorithm for adding two numbers:

1. Start

2. Read numbers a and b

3. Calculate sum = a + b

4. Print sum

5. End

Unit – V: Simple Arithmetic Problems

Examples:

1. Addition of two numbers:

   • Algorithm to add two numbers and print result.

2. Multiplication of numbers

3. Checking if a number is positive or negative

4. Finding maximum of two numbers

5. Sum of first n natural numbers

6. Prime number check

7. Factorial calculation using recursion

Unit – VI: Functions

Types of Functions:

1. Function Declaration: Function ka signature bataata hai, jaise return type, function name, aur parameters.

2. Function Definition: Function ka body define karta hai, jo actual task perform karta hai.

3. Function Call: Jab function ko call kiya jata hai, toh function execute hota hai.

Example:

c

code

int add(int a, int b) { 

    return a + b; 

}

int main() {

    int result = add(5, 3);

    printf("%d", result);  // Output: 8

    return 0;

}

Recursion:

• Ek function apne aap ko call karta hai jab tak base condition nahi milti. Example of factorial using recursion:

c

code

int factorial(int n) {

    if (n == 0) return 1;

    else return n * factorial(n - 1);

}

COMPUTER PROGRAMMING FOR PROBLEM SOLVING NOTES PPT 

1. 18CS42-DESIGN AND ANALYSIS OF ALGORITHMS Notes PPT

2. 18CS43-OPERATING SYSTEMS Notes PPT

3. 18CS44-MICROCONTROLLER AND EMBEDDED SYSTEMS Notes PPT

4. 18CS45-OBJECT ORIENTED CONCEPTS Notes PPT

5. 18CS46-DATA COMMUNICATION Notes PPT

6. 18CS47-DESIGN & ANALYSIS OF ALGORITHM LAB MANUAL

7. 18CSL48-MICROCONTROLLER AND EMBEDDED SYSTEMS LABORATORY MANUAL