CODEWITHSUNDEEP
carrays
Prashin Jeevaganth
Prashin Jeevaganth

Reputation: 1343

Sum of elements in a C array

I have just started learning C today, not very used to the syntax since previously I had only been using Python. I have this assignment.

Write a function that returns the sum of first n numbers in num_array of size 10. If n is an invalid number (i.e. not within 0 to 10 inclusive), return the value -1 instead to indicate an error.

Here's my attempt, which is not working for some reason. I don't have a proper IDE to check my code as I do not know any free newbie friendly IDEs for beginners. Can anyone tell me what went wrong here?

int num_array[10] = {3, 4, 6, 1, 0, 9, 8, 6, 2, 5};

int nth_sum_of_num_array(int n) {
    if !(0 <= n <= 10) {
        return -1;
    }
    else {     
        int result = 0; 
        for (int i = 0; i < n; i++) {
            result += num_array[i];
        }
        return result;
        }

}

I would also appreciate suggestions on a free and newbie friendly C IDE with compilers.

Upvotes: 0

Views: 134

Answers (2)

Niklas Rosencrantz
Niklas Rosencrantz

Reputation: 26647

You just need to change the condition:

#include <stdio.h>

int num_array[10] = {3, 4, 6, 1, 0, 9, 8, 6, 2, 5};

int nth_sum_of_num_array(int n) {
    if (n > 9|| n < 0) {
        return -1;
    } else {
        int result = 0;
        for (int i = 0; i < n; i++) {
            result += num_array[i];
        }
        return result;
    }
}

int main(void) {
    printf("The result is %d", nth_sum_of_num_array(6));
}

BTW, for a good C IDE, try .

Upvotes: 2

smac89
smac89

Reputation: 43098

This may work in python:

if !(0<=n<=10)

But not in C. This is how you do it in C:

if (n <= 0 || n >= 10) {

Each condition has to be separated by a logical operator.

Upvotes: 2

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