Calculating sum of array - c

Question

#include <stdio.h>
#include <stdlib.h>
int main(void) {
int numOfMeal, items[50];//, sum;
printf("Enter number of meals/snacks: ");
scanf("%d",&numOfMeal);
for(int i=1; i<=numOfMeal;i++)
{
printf("Enter kilojoules for item %d: ", i);
scanf("%d", &items[numOfMeal]);
}
printf("Your total kilojoules are: %d", items[numOfMeal]);
return EXIT_SUCCESS;
}
any ideas on how to calculate the sum of arrays, when i run this program it only displays the last kilojoule entered..

Answer 1

1.
You should run the loop from 0 to numOfMeal-1 because array indexing starts from the 0, not 1. If you are accessing the nth element that is a segmentation fault.
2.
The second problem in your code is that you are not taking the input values in the array. Your loop is, again and again, overwriting the items[numOfMeal] which is the last element in your array.
Write your code as below:
int numOfMeal, items[50],sum=0;
printf("Enter number of meals/snacks: ");
scanf("%d",&numOfMeal);
for(int i=0; i<numOfMeal;i++) // run loop from 0 to numOfMeal-1
{
printf("Enter kilojoules for item %d: ", i);
scanf("%d", &items[i]); // take the input at ith position in the array
sum+=items[i]; // sum them
}
printf("Your total kilojoules are: %d", sum); // print the final result
The short code for this can be
int numOfMeal, item, sum=0;
scanf("%d",&numOfMeal);
for(int i=0; i<numOfMeal;i++){
scanf("%d", &item);
sum+=item;
}
printf("Your total kilojoules are: %d", sum);
In this code I am not storing the value in the array, just saving it temporarily in the variable and add it to sum variable.

Answer 2

1) change your for loop. indexes of array start at 0. change i = 1 to i = 0 and i <= numOfMeal to i < numOfMeal
2) you have to calculate sum of array elements in loop
...
int result = 0;
for (int i = 0; i < numOfMeal; i++)
{
...
result += items[i];
}
printf("Your total kilojoules are: %d", result);
...