Thread: Inline keyword

Hi everyone,

I couldn't decide where I should use the inline keyword: in function prototype of the function definiton.

Code:

#include <stdio.h>
int func(int x, int y);

int main(void){
    int a,b;
    printf("Enter values for x and y\n");
    scanf("%d",&a);
    scanf("%d",&b);
    int c=func(a,b);
    printf("%d",c);
    return 0;
}

inline int func(int x, int y){
    return (x+y)*(x+y);
}

Code:

#include <stdio.h>
inline int func(int x, int y);

int main(void){
    int a,b;
    printf("Enter values for x and y\n");
    scanf("%d",&a);
    scanf("%d",&b);
    int c=func(a,b);
    printf("%d",c);
    return 0;
}

int func(int x, int y){
    return (x+y)*(x+y);
}

These both works but when I use inline in both of them it doesn't work.

Code:

#include <stdio.h>
inline int func(int x, int y);

int main(void){
    int a,b;
    printf("Enter values for x and y\n");
    scanf("%d",&a);
    scanf("%d",&b);
    int c=func(a,b);
    printf("%d",c);
    return 0;
}

inline int func(int x, int y){
    return (x+y)*(x+y);
}

As my understanding I should use it either in prototype or definetion but not both. However is there any difference between using it in prototype or definition?

Originally Posted by laserlight

Ditch the prototype and just use the function definition as a declaration.

Thank you very much for your reply. All the examples I have seen is like you said. However I just wanted to learn the detail for the use of both.