sum of n numbers in c using for loop

 Here is example of a C program that uses a for loop to calculate the sum of 'n' numbers:

1. #include <stdio.h>
2. 
   
3. int main() {
4.     int n, i, num, sum = 0;
5. 
   
6.     printf("Enter the value of n: ");
7.     scanf("%d", &n);
8. 
   
9.     for (i = 1; i <= n; i++) {
10.         printf("Enter the number: ");
11.         scanf("%d", &num);
12.         sum += num;
13.     }
14. 
    
15.     printf("The sum of %d numbers is %d\n", n, sum);
16. 
    
17.     return 0;
18. }
19. 
    

In this program, first, the user is prompted to enter the value of 'n' (the number of numbers to be added). Then, a for loop is used to iterate 'n' times and prompt the user to enter a number in each iteration. The variable 'sum' is initialized to 0 and it's being used to keep the sum of all numbers entered by the user. In each iteration, the value of 'num' is added to 'sum' using the += operator. Finally, the program prints the sum of 'n' numbers.

In this example, the for loop starts with i=1, and it will run as long as i <= n, with i being incremented by 1 in each iteration.

It's important to note that, if you want to input the n numbers at once, you can use an array and use a for loop to iterate over the array and add the numbers to the sum variable.

This C program uses a for loop to calculate the sum of 'n' numbers by prompting the user to enter a number in each iteration of the loop, adding it to a running sum, and finally printing the total sum at the end. This is a simple and efficient way to calculate the sum of multiple numbers.