While loops that count

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Here is a C program that counts up from 1 to 8.

Here is the C code.

#include <stdio.h>

int main() {
	int limit1;
	int count1;

	limit1 = 8;
	count1 = 0;
	while (count1 != limit1) {
		count1 += 1;
		printf("%d\n",count1);
		}
	return 0;
	}

Here is the output of the C code.

Here is a C program that counts up from 0 to 7.

Here is the C code.

#include <stdio.h>

int main() {
	int count1;
	int limit1;

	count1 = 0;
	limit1 = 8;
	while (count1 != limit1) {
		printf("%d\n",count1);
		count1 += 1;
		}
	return 0;
	}

Here is the output of the C code.

Here is a C program that down from 8 to 1.

Here is the C code.

#include <stdio.h>

int main() {
	int count1;
	int limit1;

	limit1 = 8;
	count1 = limit1;
	while (count1 != 0) {
		printf("%d\n",count1);
		count1 -= 1;
		}
	return 0;
	}

Here is the output of the C code.

Here is a C program that counts down from 7 to 0.

Here is the C code.

#include <stdio.h>

int main() {
	int count1;
	int limit1;

	limit1 = 8;
	count1 = limit1;
	while (count1 != 0) {
		count1 -= 1;
		printf("%d\n",count1);
		}
	return 0;
	}

Here is the output of the C code.

For beginning programmers, you should check your loop as follows.

Check the first case to make sure that the loop starts correctly.
Check the last case to make sure that the loop ends correctly. This case is usually harder than the first case.

A professional programmer would determine the loop invariant and prove the loop correct for all possible cases, but that is beyond the scope of this course.