Arguments and Local Variables

In Chapter 5, “Program Looping,” you developed programs for calculating triangular numbers. Here you define a function to generate a triangular number and call it, appropriately enough, calculateTriangularNumber. As an argument to the function, you specify which triangular number to calculate. The function then calculates the desired number and displays the results. Program 13.4 shows the function to accomplish the task and a main routine to try it.

Program 13.4

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#import <Foundation/Foundation.h>// Function to calculate the nth triangular numbervoid calculateTriangularNumber (int n){   int i, triangularNumber = 0;    for ( i = 1; i <= n; ++i )        triangularNumber += i;    NSLog (@"Triangular ...

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