3 November

Calendar program, version 1

#include <stdio.h>

int main()
{
	int days;
	printf("Enter number of days in month:");
	scanf("%d", &days);

	int start;
	printf("Enter start day (0=Sun, 1=Mon, ..., 6=Sat): ");
	scanf("%d", &start);

	printf(" Sun Mon Tue Wed Thu Fri Sat\n");
	// space over to the correct position for day 1
	for(int i = 1; i <= days; i++)
	{
		printf("%4d", i);
		if((i+start) % 7 == 0)
		{
			printf("\n");
		}
	}
	printf("\n\n");
	return 0;
}

Calendar program, version 2

#include <stdio.h>

int main()
{
	int days;
	printf("Enter number of days in month:");
	scanf("%d", &days);

	int start;
	printf("Enter start day (0=Sun, 1=Mon, ..., 6=Sat): ");
	scanf("%d", &start);

	printf(" Sun Mon Tue Wed Thu Fri Sat\n\n");
	int count = 1 - start;
	for(int i = 0; i < 6; i++)
	{
		for(int j = 0; j < 7; j++)
		{
			if(count<1||count>days)
			{
				printf("%4s", "");
			}
			else
			{
			printf("%4d", count);
			}
			count++;
		}

		printf("\n");
	}
	return 0;
}