(Problem 19)Counting Sundays

#include <stdio.h> 
#include <stdbool.h>

const int a[2][12] = {{31,28,31,30,31,30,31,31,30,31,30,31},
                     {31,29,31,30,31,30,31,31,30,31,30,31}};


bool leapYear(int n)  //判断闰年
{
    return (((n % 4 ==0) && (n % 100 !=0)) || (n % 400 == 0));
}

bool issunday(int n) //判断某天是否是星期天
{
    return (n % 7 == 0 ? true : false);
}

void solve(void)
{
    int num, i, j, count;
    count = 0;

    i = 1901;
    num = 1;
    while(i < 2000) {

        int t = (leapYear(i) ? 1 : 0);   //判断闰年
        for(j = 0; j < 12; j++) {
            num += a[t][j];
            if(issunday(num)) count++;
        }
        i++;
    }
    printf("%d\n",count);
}

int main(void)
{
    solve();
    return 0;
}