C语言控制台输出日历。先输入年份，然后输入每行显示的月份个数。

如图：

代码如下：

#include <stdio.h>int main(void)
{int a, i, j, n, k, t, w, x, y, z;static int d[13][78];int m[14] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};char wst[] = " Sun Mon Yue Wed Thu Fri Sat   ";printf("Please enter the year: ");scanf("%d", &y);if(y%4==0 && y%100!=0 || y%400==0)  /*闰年的二月为29天*/m[2] = 29;w = (y+(y-1)/4-(y-1)/100+(y-1)/400)%7; /*计算y年元旦为星期w*/for(i=1; i<=12; i++){a = 1;for(j=1; j<=6; j++){for(k=0; k<=6; k++){while(k<w) k=k+1;d[i][j*10+k] = a;  /*计算i月的第j个星期的星期w的日期为a*/a=a+1;w = k+1;if(w==7) w=0;if(a>m[i]) break;}if(a>m[i]) break;}}printf("input x(1,2,3,4,5,6): ");scanf("%d", &x);for(k=1; k<=16*x-3; k++)printf(" ");printf("=====%d=====\n", y);   /*打印年号*/for(n=1; n<=12/x; n++){t = x*(n-1)+1;printf("\n    ");for(z=1; z<=x; z++){for(k=1; k<=15; k++)printf(" ");printf("%2d", t+z-1);   /*打印月号*/for(k=1; k<=14; k++)printf(" ");}printf("\n      ");for(z=1; z<=x; z++)      /*按一横排x个月格式打印*/printf("%s", wst);   /*打印星期标题*/for(j=1; j<=6; j++){printf("\n  ");for(i=t; i<=t+x-1; i++){printf("   ");for(k=0; k<=6; k++)if(d[i][j*10+k]==0) /*空缺日期位置打印空格*/printf("    ");elseprintf("%4d", d[i][j*10+k]);/*打印日期*/}}}return 0;
}