Statements with while loops

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by RS admin@ycp.powersoftwo.org

1. Statements with while loops

This page has some examples and questions involving assignment statements with while loops.

2. Example 1

Here is the C code.

#include <stdio.h>

int main() {
	int r, x, p, k, z;
	r = 4;
	x = 7;
	p = x * 5;
	k = 6 + p;
	z = r / k;
	while ( p <= k ) {
		p++;
		z++;
		}
	printf("%d",z % 10);
	return 0;
	}

Here are the final values of the variables in the program (main).

r == 4 x == 7 p == 35 (before loop) k == 41 z == 0 (before loop)

The final value of variable z is 7. The output is the remainder left over when z is divided by 10, which is 7 (the answer). Here is the output of the C code.

7

3. Example 2

Here is the C code.

#include <stdio.h>

int main() {
	int r, w, q, c, v;
	r = 7;
	w = 6;
	q = 3 + w;
	c = q * 5;
	v = r / c;
	while ( q <= c ) {
		c--;
		v++;
		}
	printf("%d",v % 10);
	return 0;
	}

Here are the final values of the variables in the program (main).

r == 7 w == 6 q == 9 c == 45 (before loop) v == 0 (before loop)

The final value of variable v is 37. The output is the remainder left over when v is divided by 10, which is 7 (the answer). Here is the output of the C code.

7

4. Example 3

Here is the C code.

#include <stdio.h>

int main() {
	int d, n, k, a, b;
	d = 7;
	n = 5;
	k = d / 3;
	a = n * 6;
	b = k + a;
	while ( k <= a ) {
		a--;
		b++;
		}
	printf("%d",b % 10);
	return 0;
	}

Here are the final values of the variables in the program (main).

d == 7 n == 5 k == 2 a == 30 (before loop) b == 32 (before loop)

The final value of variable b is 61. The output is the remainder left over when b is divided by 10, which is 1 (the answer). Here is the output of the C code.

1

5. End of page

6. Multiple choice questions for this page

by RS admin@ycp.powersoftwo.org