Question

So I’m a little confused here. I’m working on a bigger project, but ran into a few problems, so I wrote a little test case using a simple struct:

#include <stdio.h>

typedef struct{
    int property1;
}test;

int main(){
    test testing = getNumber();
    printf("%d",testing.property1);
    return 0;
}

test getNumber(){
    test testing = {2};
    return testing;
}

All I’m trying to do is read a property from the test struct returned from getNumber(). However, the compiler complains with the following error:

test.c(8) : error C2440: ‘initializing’ : cannot convert from ‘int’ to ‘test’

So my question is: why is this function trying to return an int despite me specifying a test return type? How do I fix this? Am I just blind to something simple?

Answer 1

You’re missing a prototype:

#include <stdio.h>

typedef struct{
    int property1;
}test;

test getNumber(void); // <<< missing prototype

int main(){
    test testing = getNumber();
    printf("%d",testing.property1);
    return 0;
}

test getNumber(void){
    test testing = {2};
    return testing;
}