In C programming. How do I find the max and min values of the corressponding columns.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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In C programming. How do I find the max and min values of the corressponding columns.

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define NROWS 5
#define NCOLS 5

int main(void)
{
    int i,j, max, min, m, n;
    float M[NROWS][NCOLS], Mt[NROWS][NCOLS];
    char key_hit;
    
    //Input the sizes
    printf("ROW size(1-5) :   ");scanf("%d",&m);
    printf("Column size(1-5): ");scanf("%d",&n);
    
    //Size Check 
    while(m>NROWS || n>NCOLS)
    {
        printf("Please re-enter the sizes. \n");
        printf("Row size(1-5)   :  ");scanf("%d", &m);
        printf("Column size(1-5) : ");scanf("%d", &n);
    }
    
    //Input the Matrix Data 
    for(i=0; i<m; i++)
        for(j=0; j<n; j++)
        {
           printf("M[%d][%d] = ", i,j);
           scanf("%f", &M[i][j]);
        }
        
    //Print the Matrix Data 
    for(i=0; i<m; i++)
    {
        for(j=0; j<n; j++)
        {
            printf("%1.2f\t", M[i][j]);
        }
        printf("\n");
    }
    //Choices of matrix operations
    do{
    printf("\n\nIs there anything choice you would like to do?");
    printf("\nThe numbers related to the choices are listed below:"); 
    printf("\n1. Display The matrix M.");
    printf("\n2. Display The Matrix and its transpose.");
    printf("\n3. Max Values of each column.");
    printf("\n4. End the program.");
    printf("\nPlease enter your choice (the number): ");
    scanf(" %c", &key_hit);
    key_hit == '0';
    
    //Option 1. Display Matrix M
    if (key_hit == '1')
    {
       printf("M     = ");
       for(i=0; i<m; i++)
     {
        for(j=0; j<n; j++)
        {
            printf("%.2f\t", M[i][j]);
        }
        printf("\n\t");
     }
        
    }
    // Transpose of Matrix M
    if (key_hit == '2')
    {
       printf("M^t   = ");
       for(i=0; i<m; i++)
     {
        for(j=0; j<n; j++)
        {
            Mt[i][j] = M[j][i];
            printf("%.2f\t", Mt[i][j]);
        }
        printf("\n\t");
     }
        
    }
    //Min and Max values of Columns
    if(key_hit == '3')
    {
         min = M[1][1];
         max = M[1][1];
          for(i=1; i<m; i++)
              for(j=1; j<n; j++)
              {  
                 if(M[i][j] < min)
                 {
                   min = M[j];   
                 }

                 if(M[i][j] > max)
                 {
                 max = M[j];  
                 }
              }
         printf("\nThe max column value entry is: %i", max);
         printf("\nThe min column value entry is: %i", min);
    }
    }while(key_hit!='4');
    
    
    return 0; 
}

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