How to work c printf() function

Printf function can be used to display the value of a variable on the output screen.

How to display on the output screen. 2 informations are important for that. They are,

1. format specifier

2. variable name

If you want to print the value of an integer variable, the format specifier for integer is %d.

int %d

Syntax:

printf(“%d”,int_variable_name);

If you want to print the value of a float variable, the format specifier of float is %f.

float %f

Syntax

printf(“%f”,float_variable_name);

If you want to print the value of a double variable, its format specifier is %lf.

double %lf

Syntax

printf(“%\f”,double_variable_name);

If you want to print the value of a character variable, its format specifier is %c.

char %c

Syntax:

printf(“%c”,character_variable_name);

How does printf print variable value?

int i=7;

printf(“value of i:%d\n”,i);

Output

Value of i: 7

First it checks the statement int i=10.

A memory is created for the integer variable i and stores its value 7.

Printf(“value of i:%d\n”,i);

In this statement, the first value of i: will be printed on the output screen. %d is the integer format specifier. Next to that are i. Here the value of variable i is 7. It will take that value and put it where %d is.

In output we have,

The value of i:7 will be displayed.

Multiple Value Print The One Statement

int x=7;

char y='a';

printf(“x=%d\t y=%c\t”,x,y);

Output:

x=7 y=a

x is an integer variable whose value is 7.

First, memory is created for the integer variable x. The value 7 is stored in the memory created.

Next, the memory is created for the character variable y, in which the character a is stored.

printf(“x=%d\t y=%c\t”,x,y);

First "x =" is printed and then there is %d. After seeing %d, it fetches the value 7 in x next to Comma and puts it where %d is.

Next, \t is 4 spaces away from the cursor. There, the message "y=" is printed. Next is %c. After seeing this, the character 'a' is stored in the second variable y next to Comma. fetches and places it where %c is.

Now on the output screen,

x=7 y=a

are printed.

From this we know that we can print by giving values higher than one in a prinf().