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C Program to Sort an array of names or strings

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  • Difficulty Level : Easy
  • Last Updated : 23 Jun, 2022
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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. 

C




#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)


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