Calculating Sum of Number of elements

Q. Write a C program to accept the number of elements to be insert from the user and calculate these elements sum.

For example:

if user enter no. of elements : 5
then he/she should enter elements value as:
Enter 1 element/number : 2
Enter 2 element/number : 7
Enter 3 element/number : 1
Enter 4 element/number : 10
Enter 5 element/number : 50
Result will be : 
Sum of elements/numbers : 70


/*c program for entered number of elements and calculate the sum*/
int main()
 int num,arr[20],i,sum=0;
 //arr[20] value of changeable as big value

 printf("Enter number of element : ");
 scanf("%d", &num);
 for(i=1; i<=num; i++)
    printf("Enter %d element : ",i);
    scanf("%d", &arr[i]);
 for(i=1; i<=num; i++)
    sum = sum + arr[i];
 printf("\nSum of all numbers : %d",sum);
 return 0;

The output of above program would be

Output of Calculating Sum of Number of elements C program
Figure : Screen-shot for Calculating Sum of Number of
 elements C program


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  2. sir i was pertaining of an alternate addition and subtraction example 1+2-3+4-5= -1
    something like that :) thank you :) sorry for the misunderstanding