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Factorial in C

Write a program in c to find the factorial of a number #include <stdio.h> int main(){   int i=1,f=1,num;   printf( "Enter a number: " );   scanf( "%d" ,&num);   while (i<=num){       f=f*i;       i++;   }   printf( "Factorial of %d is: %d" ,num,f);   return 0; } Sample output: Enter a number: 5 Factorial of 5 is: 120 Do you know what is zero (0) Factorial ?