Rational/Exp1

//stupid code. Don't bother reading.

#include<stdio.h>

typedef struct
{
    int n,d;
}rational;

void simple(int n,int d)
{printf("\nThe simplified form of %d/%d is %d/%d\n",n,d,n/simp(n,d),d/simp(n,d));
}

int simp(int n,int m)
    { if(m<=n && n%m == 0)
       return m;
      if(n < m)
       return simp(m,n);
      else
       return simp(m,n%m);
     }
void add(int m,int n,int c,int d)
{
    int a,b,g;

    a=m*d+c*n;
    b=d*n;
    g=simp(a,b);
    a/=g;
    b/=g;
    printf("\nAddition of %d/%d and %d/%d is %d/%d\n",m,n,c,d,a,b);
}

void sub(int m,int n,int c,int d)
{
    int a,b,g;

    a=m*d-c*n;
    b=d*n;
    g=simp(a,b);
    a/=g;
    b/=g;

    printf("\nSubtraction of %d/%d and %d/%d is %d/%d\n",m,n,c,d,a,b);
}

void mul(int m,int n,int c,int d)
{
    int a,b,g;

    a=m*c;
    b=n*d;
    g=simp(a,b);
    a/=g;
    b/=g;

    printf("\nProduct of %d/%d and %d/%d is %d/%d\n",m,n,c,d,a,b);
}

void div(int m,int n,int c,int d)
{
    int a,b,g;
    a=m*d;
    b=n*c;

    g=simp(a,b);
    a/=g;
    b/=g;

    printf("\nProduct of %d/%d and %d/%d is %d/%d\n",m,n,c,d,a,b);
}

void comp(int m,int n,int c,int d)
{
    float a,b;

    a=(float)m/n;
    b=(float)c/d;
    if(a>b)
    printf("\nGreater among %d/%d and %d/%d is %d/%d\n",m,n,c,d,m,n);
    else
    printf("\nGreater among %d/%d and %d/%d is %d/%d\n",m,n,c,d,c,d);
}

void invertendo(int m,int n)
{   printf("\nAfter Invertendo the rational number becomes %d/%d\n",n,m);
}

void main()
{
    int c;
    rational x,y;
    printf("\nChoose the operation you would like to perform\n");
    printf("\n1.Addition\n2.Subtraction\n3.Multiplication\n4.Division\n5.Comparison\n6.Invertendo\n7.Simplify the rational number\n0.Exit\n");
    scanf("%d",&c);
while(c>7)
{   printf("\nInvalid Choice. Try again\n");
    scanf("%d",&c);
}
switch(c)
{
    case 1:
{
    printf("\nEnter the numerator and denominator of the first rational number\n");
    scanf("%d%d",&x.n,&x.d);
    printf("\nEnter the numerator and denominator of the second rational number\n");
    scanf("%d%d",&y.n,&y.d);
    add(x.n,x.d,y.n,y.d);
break;
}
    case 2:
{   printf("\nEnter the numerator and denominator of the first rational number\n");
    scanf("%d%d",&x.n,&x.d);
    printf("\nEnter the numerator and denominator of the second rational number\n");
    scanf("%d%d",&y.n,&y.d);
    sub(x.n,x.d,y.n,y.d);
break;
}
case 3:
{   printf("\nEnter the numerator and denominator of the first rational number\n");
    scanf("%d%d",&x.n,&x.d);
    printf("\nEnter the numerator and denominator of the second rational number\n");
    scanf("%d%d",&y.n,&y.d);
    mul(x.n,x.d,y.n,y.d);
break;
}
case 4:
{   printf("\nEnter the numerator and denominator of the first rational number\n");
    scanf("%d%d",&x.n,&x.d);
    printf("\nEnter the numerator and denominator of the second rational number\n");
    scanf("%d%d",&y.n,&y.d);
    div(x.n,x.d,y.n,y.d);
break;
}
case 5:
{   printf("\nEnter the numerator and denominator of the first rational number\n");
    scanf("%d%d",&x.n,&x.d);
    printf("\nEnter the numerator and denominator of the second rational number\n");
    scanf("%d%d",&y.n,&y.d);
    comp(x.n,x.d,y.n,y.d);
break;
case 6:
{   printf("\nEnter the numerator and denominator of the rational number\n");
    scanf("%d%d",&x.n,&x.d);
    invertendo(x.n,x.d);
break;
}
case 7:
{   printf("\nEnter the numerator and denominator of the rational number\n");
    scanf("%d%d",&x.n,&x.d);
    simple(x.n,x.d);
break;
}
}
}}