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#include <stdio.h>
void main()
{
    double world;
    unsigned letter;
    short stay;
    long memories;
    printf("I miss you.\n");
}
$ gcc i_miss_you.c
i_miss_you.c:2:1: warning: return type of 'main' is not 'int' [-Wmain-return-type]
void main()
^
i_miss_you.c:2:1: note: change return type to 'int'
void main()
^~~~
int
1 warning generated.