I'm confused..

I'm trying to make a simple calculator. Everything's fine except my compiler is saying

||In function 'main':|
|49|error: redefinition of 'div'|
|28|note: previous definition of 'div' was here|
|86|error: redefinition of 'div'|
|49|note: previous definition of 'div' was here|
||=== Build finished: 2 errors, 0 warnings ===|

I originally had [code]
int div ( int x, int y);
int mult (int x, int y);
int add (int x, int y);
int sub (int x, int y);[code]

and I had div, mult, add and sub respectively in place of "div" in the code. Can anyone help me? I just wanna compile this! :D
Thank you

Code:

---

#include <stdio.h>

int div ( int x, int y );


int main()

{




int num;
        printf( "What would you like to do?\n" );

        scanf( "%d", &num );
        if ( num == 1) {

        int x;
        int y;

        printf( "Please enter two numbers that you would like to divide" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The division of these two numbers is %d\n", div( x, y) );
        getchar();
}
        int div ( int x, int y )
{
getchar();
return x / y;
}





        if ( num == 2) {

        int x;
        int y;

        printf( "Please enter two numbers that you would like to multiply" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The product of these two numbers is %d\n", div( x, y) );
        getchar();
}
        int div (int x, int y)
{
getchar();
return x * y;
}


        if ( num == 3 ) {

        int x;
        int y;

        printf( "Please enter two numbers that you would like to add" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The sum of these two numbers is %d\n", div( x, y) );
        getchar();
}

        int dib (int x, int y)

{
getchar();
return x + y;
}

        if ( num == 4 ) {

        int x;
        int y;

        printf( "Please enter two numbers that you would like to subtract" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The difference of these two numbers is %d\n", div( x, y) );
        getchar();
        }
        int div (int x, int y)
{
return x - y;
}

}

---

you write all functions in main?why?

Try this:

Code:

---

#include <stdio.h>

int div( int x, int y );
int mult(int x, int y);
int subt(int x, int y);
int add(int x, int y);

int main()
{
    int num;
        printf( "What would you like to do?\n" );

        scanf( "%d", &num );
        if ( num == 1)
        {
        int x;
        int y;

        printf( "Please enter two numbers that you would like to divide" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The division of these two numbers is %d\n", div( x, y) );
        getchar();
    }

    if ( num == 2)
    {
        int x;
        int y;

        printf( "Please enter two numbers that you would like to multiply" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The product of these two numbers is %d\n", mult( x, y) );
        getchar();
    }

    if ( num == 3 )
    {
        int x;
        int y;

        printf( "Please enter two numbers that you would like to add" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The sum of these two numbers is %d\n", add( x, y) );
        getchar();
    }



    if ( num == 4 )
    {
        int x;
        int y;

        printf( "Please enter two numbers that you would like to subtract" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The difference of these two numbers is %d\n", subt( x, y) );
        getchar();
    }

    return 0;
}

int div( int x, int y )
{
    getchar();
    return x / y;
}

int mult(int x, int y)
{
    getchar();
    return x * y;
}

int subt(int x, int y)
{
    getchar();
    return x - y;
}

int add(int x, int y)
{
    getchar();
    return x + y;
}

---

Always, declare all your functions without forgetting any function before the main function, and always define your functions outside the main function.

study the code to understand more ;)

God Luck.

Sorted it out with

Code:

---

#include <stdio.h>

int div ( int x, int y );
int mult ( int a, int b );
int add ( int c, int d );
int sub ( int e, int f );

int main()





{
int num;
        printf( "What would you like to do?\n\n1. Divide two numbers\n2. Multiply two numbers\n3. Add two numbers\n4. Subtract two numers\n" );

        scanf( "%d", &num );
        if ( num == 1) {

        int x;
        int y;

        printf( "Please enter two numbers that you would like to divide" );
        scanf( "%d", &x );
        scanf( "%d", &y );
        printf( "The division of these two numbers is %d\n", div ( x, y) );
        getchar();
}


        if ( num == 2) {

        int a;
        int b;

        printf( "Please enter two numbers that you would like to multiply" );
        scanf( "%d", &a );
        scanf( "%d", &b );
        printf( "The product of these two numbers is %d\n", mult ( a, b) );
        getchar();
}



        if ( num == 3 ) {

        int c;
        int d;

        printf( "Please enter two numbers that you would like to add" );
        scanf( "%d", &c );
        scanf( "%d", &d );
        printf( "The sum of these two numbers is %d\n", add ( c, d) );
        getchar();
}





        if ( num == 4 ) {

        int e;
        int f;

        printf( "Please enter two numbers that you would like to subtract" );
        scanf( "%d", &e );
        scanf( "%d", &f );
        printf( "The difference of these two numbers is %d\n", sub ( e, f ) );
        getchar();
        }
        return 0;
}

int div ( int x, int y )
{
        getchar();
        return x / y;
       
}

int mult ( int a, int b )
{
        getchar();
        return a * b;
        }
       
int add ( int c, int d )
{
        getchar();
        return c + d;
}

int sub (int e, int f )
{
        getchar();
        return e - f;
}

---

Thanks guys!