C Exercises: Find two elements whose sum is closest to zero
C Array: Exercise-45 with Solution
Write a program in C to find two elements whose sum is closest to zero.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
void findMinSumPair(int *arr1, int arr_size)
{
int i, j, sum, minSum, min1Pair, min2Pair;
if(arr1 == NULL || arr_size < 2)
return;
min1Pair = arr1[0];
min2Pair = arr1[1];
minSum = min1Pair + min2Pair;
for(i = 0; i < arr_size-1; i++)
{
for(j = i+1; j < arr_size; j++)
{
sum = arr1[i] + arr1[j];
if(abs(sum) < abs(minSum))
{
minSum = sum;
min1Pair = arr1[i];
min2Pair = arr1[j];
}
}
}
printf("[%d, %d]\n", min1Pair, min2Pair);
}
int main()
{
int arr1[] = {38, 44, 63, -51, -35, 19, 84, -69, 4, -46};
int ctr = sizeof(arr1)/sizeof(arr1[0]);
int i;
//------------- print original array ------------------
printf("The given array is : ");
for(i = 0; i < ctr; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------------------------------------------------
printf("The Pair of elements whose sum is minimum are: \n");
findMinSumPair(arr1, ctr);
return 0;
}
Sample Output:
The given array is : 38 44 63 -51 -35 19 84 -69 4 -46 The Pair of elements whose sum is minimum are: [44, -46]
Flowchart:

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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);
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