C++ program to find the sum and average of given numbers using for loop

The for loop is the most commonly used statement in C++. This loop consists of three expressions. The first expression is used to initialize the index value, the second to check whether or not the loop is to be continued again and the third to change the index value for further iteration.

                         

Sometimes, the operations carried out by the while loop can also be done by using the for loop.

However, it is the programmer who has to decide which loop to be used in a given situation.

The syntax of the for loop is:

for (expression_1; expression_2; expression_3)

statement;

Now I am going to tell you a C++ program using the for loop. This program to find the sum and average of given numbers. The C++ program code is following bellow

// A program to find the sum and average of given numbers
#include <iostream.h>
void main (void)
{
int n;
cout <<"How many numbers ?\n";
cin >>n;
float sum = 0;
float a;
for (int i = 0; i <= n-1; ++i) {
cout <<"Enter a number \n";
cin >>a;
sum = sum+a;
}
float av;
av = sum/n;
cout <<"sum = " << sum << endl;
cout <<" Average = " << av << endl;
}

Output the above program

How many numbers ?
4
Enter a number
3
Enter a number
2
Enter a number
1
Enter a number
4
sum = 10
Average = 2.5