Fractions in C Language

#include

int factor (int num)

{

if (num>1)

{

return (num * factor(num-1));

}

else{}

return (1);

}

int main(void)

{

int firstnum,secnum,permdin,permfact,sub1;

printf("Enter First Number:");

scanf("%d",&firstnum);

printf("%d = %d \n\n\n",firstnum,factor(firstnum));

printf("Enter Second Number:");

scanf("%d",&secnum);

printf("%d = %d \n\n\n",secnum,factor(secnum));

if(firstnum>secnum)

{

sub1=firstnum-secnum;

permdin=factor(sub1);

permfact=(factor(firstnum)/permdin);

printf("Permutation = %d\n\n\n",permfact);

printf( "Combination : %d\n\n\n",factor(firstnum) / (factor(secnum)* factor(firstnum-secnum)));

printf("\n\n\n");

}

else

{

printf("Invalid:\n\n\n");

}

return 0;

}