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The following example program takes as input the width and height of a square and outputs the area of that square.

Programmer facing: Notice how declarations, input (and echo), process, and output are separated (with comments).

User facing: Notice how the output separates the input and output with a blank line. Here is the C code.
#include <stdio.h> int main() { // declarations double width1,height1,area1; // input printf("Enter the width and height of a square.\n"); scanf("%lf %lf",&width1,&height1); printf("You entered width as %0.2lf and height as %0.2lf.\n",width1,height1); // process area1 = width1 * height1; // output printf("\n"); printf("The width of the square is %0.2lf units.\n",width1); printf("The height of the square is %0.2lf units.\n",height1); printf("The area of the square is %0.2lf units.\n",area1); return 0; }

Here are some examples of input and output for the above program code.

Here is an example input.
1.0 1.0
For the above example input, here is the expected output.
Enter the width and height of a square. You entered width as 1.00 and height as 1.00. The width of the square is 1.00 units. The height of the square is 1.00 units. The area of the square is 1.00 units.
Here is an example input.
1.5 2.5
For the above example input, here is the expected output.
Enter the width and height of a square. You entered width as 1.50 and height as 2.50. The width of the square is 1.50 units. The height of the square is 2.50 units. The area of the square is 3.75 units.
Here is an example input.
2.3 4.5
For the above example input, here is the expected output.
Enter the width and height of a square. You entered width as 2.30 and height as 4.50. The width of the square is 2.30 units. The height of the square is 4.50 units. The area of the square is 10.35 units.