Factorial of a number
# include < stdio.h > int factorial ( int a ) { if ( a == 0 || a == 1 ) { return 1 ; } else { return ( a * factorial ( a - 1 )); } } int main () { int num ; printf ( " enter the number " ); scanf ( " %d " , & num ); printf ( " factorial of %d is %d " , num , factorial ( num )); return 0 ; }