C Exercises: Find four array elements whose sum is equal to given number
C Array: Exercise-78 with Solution
Write a program in C to find four array elements whose sum is equal to a given number.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
void sumOfFourElements (int *arr1, int size, int SUM)
{
int i, j, k, l;
printf("The elements are: \n");
for(i = 0; i < size-3; i++)
{
for(j =i+1; j < size-2; j++)
{
for(k = j+1; k < size-1; k++)
{
for(l=k+1; l<size; l++)
{
if(arr1[i] + arr1[j] + arr1[k] + arr1[l] == SUM)
{
printf("%d, %d, %d, %d\n", arr1[i],arr1[j],arr1[k],arr1[l]);
return;
}
}
}
}
}
printf("No such elements found for the given sum.\n");
}
int main() {
int arr1[] = {3, 7, 1, 9, 15, 14, 6, 2, 5, 7};
int sumGiven=37;
int n = sizeof(arr1)/ sizeof(arr1[0]);
int i;
//------------- print original array ------------------
printf("The given array is: \n");
for(i = 0; i < n; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
sumOfFourElements(arr1, n, sumGiven);
return 0;
}
Sample Output:
The given array is: 3 7 1 9 15 14 6 2 5 7 The elements are: 3, 15, 14, 5
Flowchart:

C Programming Code Editor:
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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
Ref : https://bit.ly/3dIwfkP
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