# Find out the sum of first n numbers

Write a C Program to find out the sum of first n numbers. Here’s simple Program to find out the sum of first n numbers in C Programming Language.

**LOGIC : : **

**LOGIC : :**

The program asks the user to enter the number of terms he/she would like to evaluate the sum of, which is stored in variable *n*. Another variable *i* is assigned value 1, which is used for counting the number of terms in the loop and also as a natural number which is added to the result.

The variable *sum *stores sum of the natural numbers. The *sum *is initialized to 0 to avoid addition of garbage numbers.As the program enters the loop, value of *i* is added to the variable *sum* which now equals the sum of all natural numbers till *i. T*hen the value of *i* is increased by 1.

The loop continues as long as the value of i is less than or equal to n as we are calculating the sum of first n natural numbers. When, the loop exits, the result is displayed on the screen.

Below is the source code for C Program to find out the sum of first n numbers which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C Program to find out the sum of first n numbers */ #include<stdio.h> #include<conio.h> int main() { int i=0,num,sum=0; printf("Enter a number :: "); scanf("%d",&num); for(;i<num;i++) { sum=sum+i; } printf("\n The sum of numbers = %d",sum); return 0; }

**OUTPUT : :**

**OUTPUT : :**

/* C Program to find out the sum of first n numbers */ Enter a number :: 6 The sum of numbers = 15

Above is the source code for C Program to find out the sum of first n numbers which is successfully compiled and run on Windows System.The Output of the program is shown above .

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