Programming Tutorials

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Sum of 1 to N in C++

By: Grant Braught in C++ Tutorials on 2011年01月27日 [フレーム]

This sample C++ program accepts a number and prints the sum of all numbers from 1 to the entered number. 
#include <iostream>
// Prototype for SumToN function.
int SumToN(int);
// main function is always run first in a
// C++ program.
int main()
{	//Given: nothing.
	//Results: Accepts a number and
	//		 writes out sum of all ints 1..num.
	int number;
	
	cout << "Enter an integer (>1): ";
	cin>> number;
	
	cout << "Sum of 1..Num = " << SumToN(number) << endl; // This is more convention than anything. return 0; } int SumToN(int number) { /* Given: number an integer> 0
	Returns: The sum of all the integers
			 between 1 and number.
	*/
	
	int i,total;
	
	total = 0;		// could use: int total = 0;
	
	for (i=1; i<=number; i++) { total = total + i; } return total; }



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