Question

How to sort only the second row of a matrix in C

Answer 1

#include <stdio.h>  
#include <stdlib.h> 
 
#define COLS 5
 
int compare(const void* a, const void* b) {
    return (*(int*)a - *(int*)b);
}

void print_matrix(int matrix[][COLS], int rows, int cols) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("%2d", matrix[i][j]);
        }
        printf("\n");
    }
}
 
int main()
{
    int matrix[][COLS] = {
                    {3, 2, 5, 1, 4},
                    {4, 9, 7, 1, 5},
                    {9, 3, 2, 0, 1},
                    {6, 8, 3, 7, 0}
    };
 
    int rows = (sizeof(matrix) / sizeof(matrix[0]));
    int cols = (sizeof(matrix) / sizeof(matrix[0][0])) / rows;
 
    qsort(matrix[1], cols, sizeof(int), compare);
 
    print_matrix(matrix, rows, cols);
 
    return 0;
}
 
 
 
 
 
/*
 
run:
 
 3 2 5 1 4
 1 4 5 7 9
 9 3 2 0 1
 6 8 3 7 0
 
*/

 

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