1. Using Iterative Approach

#include<stdio.h>

int main(){

int num;

int prod = 1;

printf("Enter any number...");

scanf("%d",&num);

printf("The factorial of %d is..\n",num);

for(int i=1;i<=num;i++){

if(i<num)

printf("%d*",i);

else printf("%d=",i);

prod = prod*i;

}

printf("%d",prod);

}

2. Using a Function

#include<stdio.h>

long long int getFact(int num){

long long int prod = 1;

printf("The factorial of %d is..\n",num);

for(int i=1;i<=num;i++){

if(i<num) printf("%d*",i);

else printf("%d=",i);

prod = prod*i;

}

return prod;

}

int main(){

int num;

printf("Enter any number...");

scanf("%d",&num);

printf("%d",getFact(num));

}

3. Using Function Recursion

#include<stdio.h>

long long int getFact(int num){

if(num>0){

if(num>1)

printf("%d*",num);

else printf("%d=",num);

return num * getFact(num-1);

}

else return 1;

}

int main(){

int num;

printf("Enter any number...");

scanf("%d",&num);

printf("The factorial of %d is..\n",num);

printf("%d",getFact(num));

}