source code, C/C++ Programming

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I hv an assignment to do, I almost done. But i cant find whats wrong- my code is to make a simple calculator using function''s all 4 patterns. I did like this-

int add (int, int);
int sub (void);
void mul (int, int);
void div (void);
int main()
int add, sub, mul, x, y;
float div;
printf("Enter the 1st number: ");
scanf("%d", &x);
printf("Enter the 2nd number: ");
scanf("%d", &y);
printf("the sum is %d",add(x,y));
printf("the substraction is %d", sub());
return 0;
int add (int x, int y)
int add;
return add;

int sub (void)
int sub, x, y;
sub= (x-y);
return sub;

void mul (int x, int y)
int mul;
printf("the product result is%d",mul);

void div (void)
int x, y;
float div;
printf("the division result is %f",div);

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