square2.c

  #include <stdio.h>

  /*  A program to calculate a square area. */
  int main()
  {
     int width, length, area;

     printf("Width : ");
     scanf("%d", &width);
     printf("Length: ");
     scanf("%d", &length);
     area = width * length;
     printf("The dimension is %d by %d\n", width, length);
     printf("The area is %d.\n", area);
     return 0;
  }

This program does exactly the same as the previous one except the width and depth are taken from user input.
While printf output to the screen, scanf takes the input from keyboard and put it inside a variable.
Notice how we use it in the program. We got the same %d in scanf, but there is no \n there.
Notice also that we have to put the & sign before the variable names when using scanf.

Where to go

Chapter 2
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