C Program to Sort an array of names or strings
Last Updated :
23 Jul, 2025
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Given an array of strings in which all characters are of the same case, write a C function to sort them alphabetically. The idea is to use qsort() in C and write a comparison function that uses strcmp() to compare two strings.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Defining comparator function as per the requirement
static int myCompare(const void* a, const void* b)
{
// setting up rules for comparison
return strcmp(*(const char**)a, *(const char**)b);
}
// Function to sort the array
void sort(const char* arr[], int n)
{
// calling qsort function to sort the array
// with the help of Comparator
qsort(arr, n, sizeof(const char*), myCompare);
}
int main()
{
// Get the array of names to be sorted
const char* arr[]
= { "geeksforgeeks", "geeksquiz", "clanguage" };
int n = sizeof(arr) / sizeof(arr[0]);
int i;
// Print the given names
printf("Given array is\n");
for (i = 0; i < n; i++)
printf("%d: %s \n", i, arr[i]);
// Sort the given names
sort(arr, n);
// Print the sorted names
printf("\nSorted array is\n");
for (i = 0; i < n; i++)
printf("%d: %s \n", i, arr[i]);
return 0;
}
Output
Given array is 0: geeksforgeeks 1: geeksquiz 2: clanguage Sorted array is 0: clanguage 1: geeksforgeeks 2: geeksquiz
Time Complexity: O(nlogn)
Auxiliary Space: O(1)
