Programming in Objective-C, Sixth Edition

The for Statement

Let’s take a look at a program that uses the for statement. The purpose of Program 5.2 is to calculate the 200th triangular number. See whether you can determine how the for statement works.

Program 5.2

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// Program to calculate the 200th triangular number// Introduction of the for statement#import <Foundation/Foundation.h>int main (int argc, char * argv[]){   @autoreleasepool {      int n, triangularNumber;      triangularNumber = 0;      for ( n = 1; n <= 200; n = n + 1 )         triangularNumber += n;      NSLog (@"The 200th triangular number is %i", triangularNumber);   }   return 0;}

Program 5.2 Output

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The 200th triangular number is 20100

Some explanation is ...