Question

How to create a matrix with random numbers between 1 and 100 in C++

Answer 1

#include <iostream>
#include <iomanip>
#include <ctime>
  
#define ROWS 5
#define COLS 6
 
void printMatrix(int matrix[][COLS]) {
    for (int i = 0; i < ROWS; i++) {  
        for (int j = 0; j < COLS; j++) {
            std::cout << std::setw(3) << matrix[i][j] << " ";
        } 
        std::cout << "\n";
    }
}
   
int generateRandomInteger(int min, int max) {
    return min + rand() / (RAND_MAX / (max - min + 1) + 1);
    // return rand() % (max - min + 1) + min;
}
       
void generateRandomMatrix(int matrix[][COLS]) {
    srand(time(NULL));
      
    for (int i = 0; i < ROWS; i++) {     
        for (int j = 0; j < COLS; j++) {
            matrix[i][j] = generateRandomInteger(1, 100);
        }
    }
}
 
int main() {
    int matrix[ROWS][COLS] = {{ 0 }};
      
    generateRandomMatrix(matrix);
         
    printMatrix(matrix);
}
  
  
  
  
/*
run:
   
 23  82  60  17  16  99 
 28  61  17  75  98  95 
 19   1  78 100  36  94 
 49  33  55  63  85   8 
 62 100  61  43  46  68 
   
*/

 

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