C语言例题-打印日历

编写程序显示单月的日历。用户指定这个月的天数和该月起始日是星期几。

# include <stdio.h>

int main()
{
	int day;
	int i, j;
	int week;

	printf("Enter number of days in month: ");
	scanf("%d", &day);
	printf("Enter starting day of the week (1 = Sun, 7 = Sat): ");
	scanf("%d", &week);

	for(j = 1; j < week; j++){
		printf("    ");
	}
	//打出日历开始前的空格，一个空格是4个字节

	for(i = 1; i <= day; i++){
		printf("%4d", i);
		
		if( (i + week -1) % 7 == 0){
			printf("\n");
		}
		//每7天换一行
	}

	printf("\n");

	return 0;
}