// designate.c -- use designated initializers
#include <stdio.h>
#define MONTHS 12
int main(void)
{
    int days[MONTHS] = {31,28, [4] = 31,30,31, [1] = 29};
    int i;
    
    for (i = 0; i < MONTHS; i++)
        printf("%2d  %d\n", i + 1, days[i]);
    
    return 0;
}