I am to write a program to read a non-negative integer n and call function add_it() to calculate the sum ... If n is 5, the sum 1+2+3... would be computed. n must be less than 8943923. Use a for loop, rather than the summation formula. I am to put main() and add_it() in the same file by calling add_it(). The following is what I have come up with, but I am getting the wrong answer main() {

```
int main() {
int n,sum; {
printf("Enter a non_negative number to sum:\n");
scanf("%d", &n);
int add_it() {
int n,sum; {
n<8943923;
for (n=0;
n<8943923;
n*(n+1)/2) {
printf("%d\n",n);
sum=n*(n+1)/2;
if (n<8943923) break;
}}}
printf("The summation of %d is %d\n",n,sum);
return(sum);
}}
```

When I execute the program I get the following:

Enter a non-negative number to sum: (I enter say 20)

The summation of 20 is 4.

This is what I want except the answer should not be 4.

Can anyone help me figure out where I went wrong in this for loop and my equation for getting the sum? Thank you to all who may respond.

*Edited 3 Years Ago by Dani*: Formatting fixed