Ambiguating new declaration of 'void scan_fraction(int*, int*)' - c

Question

I am trying to compile my code and this error is popping up:
#include <stdio.h>
//Prototype
int scan_fraction(int *nump, int *denomp);
//Execution
int main ()
{
int nump, denomp;
scan_fraction(&nump, &denomp);
}
//Definition
void scan_fraction(int *nump, int *denomp)
{
char slash; /* character between numerator and denominator */
int status; /* status code returned by scanf indicating
number of valid values obtained */
int error; /* flag indicating presence of an error */
char discard; /* unprocessed character from input line */
do {
/* No errors detected yet */
error = 0;
/* Get a fraction from the user */
printf("Enter a common fraction as two integers separated ");
printf("by a slash> ");
status = scanf("%d %c%d",&nump, &slash, denomp);
/* Validate the fraction */
if (status < 3) {
error = 1;
printf("Invalid-please read directions carefully\n");
} else if (slash != '/') {
error = 1;
printf("Invalid-separate numerator and denominator");
printf(" by a slash (/)\n");
} else if (denomp <= 0) {
error = 1;
printf("Invalid—denominator must be positive\n");
}
/* Discard extra input characters */
do {
scanf("%c", &discard);
} while (discard != '\n');
} while (error);
}
What could be the error? Can somebody explain to me why it is the error. I'm still learning at C.

Answer 1

You declare this:
int scan_fraction(int* nump, int* denomp);
And your implementation is this:
void scan_fraction(int* nump, int* denomp)
Declaration and implementation don't match.
Also, you have:
status = scanf("%d %c%d", &nump, &slash, denomp);
You should use this, because nump is already a pointer to int:
status = scanf("%d %c%d", nump, &slash, denomp);
Your compiler should be telling you about this, too.