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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int arr[] = {6, 8, 4, -5, 7, 9};
  5.     int size = sizeof(arr) / sizeof(arr[0]);
  6.     int sum = 15;
  7.     int found = 0;
  8.  
  9.     for (int i = 0; i < size - 1; i++) {
  10.         for (int j = i + 1; j < size; j++) {
  11.             if (arr[i] + arr[j] == sum) {
  12.                 printf("Pair of elements can make the given sum by the value of index %d and %d (%d + %d = %d)\n", i, j, arr[i], arr[j], sum);
  13.                 found = 1;
  14.                 break; // Remove break if you want to find all pairs
  15.             }
  16.         }
  17.         if (found) break;
  18.     }
  19.  
  20.     if (!found) {
  21.         printf("No pair found with the given sum.\n");
  22.     }
  23.  
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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Pair of elements can make the given sum by the value of index 0 and 5 (6 + 9 = 15)
https://ideone.com/doHgPc
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

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