Write a function named sumNumbers that accepts a nonnegative number, adds up all of the numbers between 0 and the number (inclusive), and returns the sum.

int sumNumber (int n) {

if (n < 0)

return 0;

int sum = 0;

int i;

for (i = 0; i < = n; i++) {

sum = sum + i;

}

return sum;

}

Explanation:

I am going to write a C code for this.

A for loop and an initialized variable is sufficient to solve this problem.

int sumNumber (int n) {

if (n < 0)

return 0;

int sum = 0;

int i;

for (i = 0; i < = n; i++) {

sum = sum + i;

}

return sum;

}