C Program to Sort an array of names or strings

0 0 1 minute read

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[] 
        = { "zambiatek", "zambiatekquiz", "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: zambiatek 
1: zambiatekquiz 
2: clanguage 

Sorted array is
0: clanguage 
1: zambiatek 
2: zambiatekquiz

Time Complexity: O(nlogn)
Auxiliary Space: O(1)

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