第6章循环8、编写程序显示单月的日历
int i, n, start_day;
printf("Enter number of days in month: ");
scanf("%d", &n);
printf("Enter starting day of the week (1=sun, 7=Sat): ");
scanf("%d", &start_day);
for(i=1; i<start_day; i++)
printf("aaa");
for(i = 1; i<=n; i++ v ){
printf("%3d", i);
if((start_day + i - 1)% 7 == 0)
printf("\n");
}

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