Learn to Program with C_ Learn to Program using the Popular C Programming Language ( PDFDrive )

Chapter 3 ■ Programs with Sequence Logic
Points to note about Program P3.4:
• The variable average is declared as double instead of int since the average
may not be a whole number.
• If whole numbers are not entered in the data, the program will crash or, at
best, give incorrect results.
• We use 3.0 instead of 3 in calculating the average. This forces a floatingpoint
division to be performed. If we had used 3, an integer division would
be performed, giving 13.0 as the answer for the sample data, above.
• In the last printf, the first \n is used to print the blank line in the output.
• We could have declared average and assigned to it in one statement,
like this:
double average = (a + b + c) / 3.0;
• The variable average is not really necessary in this program. We could
calculate and print the average in the printf statement with
printf("\nTheir average is %3.1f\n", (a + b + c) / 3.0);
3.5.2 Problem 2 - Square
Write a program to request a whole number and print the number and its square. The program
should work as follows:
Enter a whole number: 6
Square of 6 is 36
A solution is shown as Program P3.5.
Program P3.5
//request a whole number; print its square
#include <stdio.h>
int main() {
int num, numSq;
printf("Enter a whole number: ");
scanf("%d", &num);
numSq = num * num;
printf("\nSquare of %d is %d\n", num, numSq);
}
56
www.it-ebooks.info