Write a program to print the sum of n terms In C

Sum Of n terms means that the sum from 1 to the number entered (n) by the user as an input. For e.g if the input is 10 then the output will be the sum of first 10 natural numbers i.e 1+2+3+4+5+6+7+8+9+10=55. So output of the program in c will be 55. Today we will write a program in c to find and print sum of n terms by using for loop, while loop and do while loop.

Program to print the sum of n terms In C using for loop

Note: Please use every loop one by one. I have uploaded picture to show all the three loops in one.

#include <stdio.h>
void main(){
int n, sum=0,i;
printf("Enter nth term= ");
scanf("%d",&n);

for(i=1;i<=n;i++) {
sum=sum+i;

}

printf("sum of %d terms is %d",n,sum);
getchar();
};

Program to print the sum of n terms In C using while loop

#include <stdio.h>
void main(){
int n, sum=0,i;
printf("Enter nth term= ");
scanf("%d",&n);

while(i<=n){
sum=sum+i;
i++;
}

printf("sum of %d terms is %d",n,sum);
getchar();
};

Program to print the sum of n terms In C using do while loop

#include <stdio.h>
void main(){
int n, sum=0,i;
printf("Enter nth term= ");
scanf("%d",&n);

do{
sum=sum+i;
i++;
}while(i<=n);

printf("sum of %d terms is %d",n,sum);
getchar();
};

INPUT/OUTPUT

If we enter nth term as 10 we will get 55 which is the sum of first 10 natural numbers. i.e 1+2+3+4+5+6+7+8+9+10=55

The output will be the same for while loop, do while loop and for loop also.

Conclusion

This program is written by me wasim ahmad kumar and is tested first in coding C android application and now i am posting it in my blog. If you find any mistake or you have any questions please comment down or contact me from contact us page.