用c语言编写同一年两个日期相差天数

以下是使用C语言编写的同一年两个日期相差天数的程序：

#include <stdio.h>

int main() {
    int year, month1, day1, month2, day2;
    int days_in_month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int total_days = 0;

    printf("Enter year: ");
    scanf("%d", &year);

    printf("Enter first date (mm dd): ");
    scanf("%d %d", &month1, &day1);

    printf("Enter second date (mm dd): ");
    scanf("%d %d", &month2, &day2);

    // Check for leap year
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
        days_in_month[2] = 29;
    }

    // Calculate days between dates
    if (month1 == month2) {
        total_days = day2 - day1;
    } else {
        total_days += days_in_month[month1] - day1;
        for (int i = month1 + 1; i < month2; i++) {
            total_days += days_in_month[i];
        }
        total_days += day2;
    }

    printf("Total days between dates: %d\n", total_days);

    return 0;
}

该程序首先要求用户输入年份以及两个日期，然后检查是否为闰年，并使用每个月的天数数组来计算两个日期之间的天数差异。最后，程序将结果输出到控制台。