Hey i am a student learning C programming and just wanted to know that why this program compiles as on line struct date *newdate, foo(); foo is declared as a function local to main function with the return type struct date. As foo is already declared as a function it should give an error of conflicting types as c does not support function overloading. Can somebody please help me.
#include <stdio.h>
#include <stdlib.h>
struct date {
int month;
int day;
int year;
};
struct date foo(struct date x) {
++x.day;
return x;
};
int main() {
struct date today = {10, 11, 2014};
int array[5] = {1, 2, 3, 4, 5};
struct date *newdate, foo();
char *string = "test string";
int i = 3;
newdate = (struct date *)malloc(sizeof(struct date));
newdate->month = 11;
newdate->day = 15;
newdate->year = 2014;
today = foo(today);
free(newdate);
return 0;
}
foo is declared as a function local to main function
Not true. It declares but does not define that a function foo exists, and that it takes an unknown number of arguments and returns a struct date.
This declaration is compatible with the actual definition of foo, as the return types match and the declaration makes no statement about the arguments.
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