Programming in C

44 Chapter 5 Program Looping

int main (void)

{

int triangularNumber;

triangularNumber = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8;

printf ("The eighth triangular number is %i\n",

triangularNumber);

return 0;

}

Program 5.1 Output

The eighth triangular number is 36

One of the fundamental properties of a computer is its ability to repetitively execute a

set of statements.These loopingcapabilities enable you to develop concise programs con-

taining repetitive processes that could otherwise require thousands or even millions of

program statements to perform.The C programming language contains three different

program statements for program looping.They are known as the forstatement, the

whilestatement, and the dostatement. Each of these statements are described in detail

in this chapter.

The forStatement

Let’s dive right in and take a look at a program that uses the forstatement.The purpose

of Program 5.2 is to calculate the 200th triangular number. See if you can determine

how the forstatement works.

Program 5.2 Calculating the 200th Triangular Number

/* Program to calculate the 200th triangular number

Introduction of the for statement */

#include <stdio.h>

int main (void)

{

int n, triangularNumber;

triangularNumber = 0;

Program 5.1 Continued