#include<stdio.h>
  #include<conio.h>
  
  void main()
  {
     int a[5];
     int i,sum=0;
 
     clrscr();
      printf("Enter the array elements\n");
      for (i=0; i<5; i++)
      scanf("%d",&a[i]);
      
      // sum of array elements
      for (i=0; i<5; i++)
      {
        sum=sum+a[i];
      }
      printf("Sum of array elements===%d",sum);
    } // end of main()

the above prog is perfect..

#include<stdio.h>
#include<conio.h>
 void main()
{
  int n[5],sum=0,i=0;
  clrscr();
  for(i=0;i<4;i++)
  {
    scanf("%d",&n[i]);
  } 
   
for(i=0;i<4;i++)
  {
   sum=sum+n[i];
  }
printf("sum are%d",sum);
getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
int i,a[10],sum;
clrscr();
printf("\n Enter the elements in an array :");
for(i=0;i<10;i++)
scanf("%d",&a[i]);
printf("\n The sum of elements of an array are :");
for((i=0;i<10;i++)
sum=sum+a[i];
printf("\t %d",sum);
getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a[10],i,sum=0;
    clrscr();
    for(i=0;i<10;i++)
    {
       printf("\n enter an elements in array");
       scanf("%d",&a[i]);
    }
    for(i=0;i<10;i++)
    {
       sum=sum+a[i];
    }
    printf("\n sum is %d",sum);
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a[10],i,sum=0;
    clrscr();
    for(i=0;i<10;i++)
    {
       printf("\n enter an elements in array");
       scanf("%d",&a[i]);
    }
    for(i=0;i<10;i++)
    {
       sum=sum+a[i];
    }
    printf("\n sum is %d",sum);
}

#include<stdio.h>
#include<conio.h>
void main()
{
int a[5];
int i,b=0;
printf("Enter the array elements\n");
for (i=0; i<5; i++)
scanf("%d",&a[i]);
for (i=0; i<5; i++)
{
b=b+a[i];
}
printf("Sum of array elements is %d",b);
}

#include<stdio.h>
#include<conio.h>
void main()
{
int a[10],sum=0,n,i;
printf("Enter range");
scanf("%d",&n);
for(i=0;i<n;i++)
scanf("%d",&a[i]);
printf("The sum of all the elements in the given array 
is\n");
for(i=0;i<n;i++)
sum=sum+a[i];
printf("%d",sum);
getch();
}