C Programming – HackerRank Solution | 2D ARRAYS- Replace Elements |

(HackerRank) Write a Modular C Programming code to solve 2D ARRAYS- Replace Elements, Write a modular C program to read a square matrix and replace all the diagonal elements with the next prime number

Write a modular C program to read a square matrix and replace all the diagonal elements with the next prime number in the sequence of the number and all the non-diagonal elements with ‘0’ (zero). If the diagonal element is already a prime number, do not replace the number.

Input Format

The first line is n indicates size of the matrix.

Next lines are matrix elements.

Constraints

n should be positive.

Output Format

Matrix after replacing the numbers.

Sample Input 0

3
6 7 3
7 8 2
8 7 5

Sample Output 0

7 0 0
0 11 0
0 0 5

Explanation 0

Matrix size is 3

Sample Input 1

0

Sample Output 1

Invalid matrix size.

Sample Input 2

1
7

Sample Output 2

7

Refer : C Programming HackerRank all solutions for Loops | Arrays | strings

 

CODE:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>

int check_prime(int n);
int main() {
    int n;
    scanf("%d",&n);
    if(n>0)
    {
    int matrix[n][n],i,j;
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {
            scanf("%d",&matrix[i][j]);
            if(i!=j)
                matrix[i][j]=0;
        }
    }
        for(i=0;i<n;i++)
        {
            while(1)
            {
            if(check_prime(matrix[i][i]))
            break;
            else
                matrix[i][i]++;
           }
        }
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {
            printf("%d ",matrix[i][j]);
        }
        printf("\n");
    }

    }
    else{
        printf("Invalid matrix size.");
    }
    return 0;
}
int check_prime(int n)
{
    for(int i=2;i<n;i++)
    {
        if(n%i==0)
        {   
            return 0;
         exit(0);
        }
    }
    return 1;
}

OUTPUT

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Input (stdin)

3
6 7 3
7 8 2
8 7 5
Your Output (stdout)

7 0 0 
0 11 0 
0 0 5 
Expected Output

7 0 0
0 11 0
0 0 5

 

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