[C/C++] Tính trung bình cộng các số dương trong ma trận số thực

Yêu cầu:
Tính trung bình cộng các số dương trong ma trận số thực

Thuật toán:
1. Viết hàm nhập vào ma trận số thực
2. Viết hàm tính trung bình cộng các số dương trong ma trận số thực

Code:

/*********Average of positive elements in matrix*************
*Author: vncoding
*Date : 31/03/2019
************************************************************/

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#define N 100
#define M 100

void ImportData(float[][M], int, int, char*);
void PrintMatrix(float[][M], int, int);
float AverageElementInMatrix(float[][M], int, int);
void main()
{
    int nRow, nCol;
    float average;
    float A[N][M];

    printf("\nNumber of row: ");
    scanf("%d", &nRow);
    printf("\nNumber of column: ");
    scanf("%d", &nCol);
  
    ImportData(A, nRow, nCol, "A");
    PrintMatrix(A, nRow, nCol);

    average = AverageElementInMatrix(A, nRow, nCol);
    if (average == -1)
        printf("All of elements are negative\n");
    else
        printf("\nAverage of positive elements in matrix: %f", average);

    getch();
}

/*************************************************************
* Function      : AverageElementInMatrix()
* Parameter     : A[][M]: input matrix (I)
                  nRow  : row number   (I)
                  nCol  : column number(I)  
* Return        : float
* Description   : Average of positive elements in matrix
*************************************************************/
float AverageElementInMatrix(float A[][M], int nRow, int nCol)
{
    int iRow, iCol;
    float average = 1.0;
    int cnt = 0;
    for (iRow = 0; iRow < nRow; iRow++)
    {
        for (iCol = 0; iCol < nCol; iCol++)
        {
            if (A[iRow][iCol] > 0)
            {
                average += A[iRow][iCol];
                cnt++;
            }     
        }
    }
    if (cnt == 0)
        average = -1.0;
    else
        average /= cnt;

    return average;
}

/*************************************************************
* Function      : ImportData()
* Parameter     : A[][M]: input matrix (I)
                  nRow  : row number   (I)
                  nCol  : column number(I)
                  nameMatrix: matrix name (I)
* Return        : void
* Description   : Import matrix data
*************************************************************/
void ImportData(float Matrix[][M], int nRow, int nCol, char* nameMatrix)
{
    int iRow, iCol;
    for (iRow = 0; iRow < nRow; iRow++)
        for (iCol = 0; iCol < nCol; iCol++)
        {
            printf("\n%s[%d][%d] = ", nameMatrix, iRow, iCol);
            scanf("%f", &Matrix[iRow][iCol]);
        }
}

/*************************************************************
* Function      : PrintMatrix()
* Parameter     : Matrix: input matrix (I)
                  nRow  : row number   (I)
                  nCol  : column number(I)
* Return        : void
* Description   : Display matrix data
*************************************************************/
void PrintMatrix(float Matrix[][M], int nRow, int nCol)
{
    int iRow, iCol;
    printf("\nA = ");
    for (iRow = 0; iRow < nRow; iRow++)
    {
        printf("\n");
        for (iCol = 0; iCol < nCol; iCol++)
        {
            printf("\t%.2f\t", Matrix[iRow][iCol]);
        }
    }
}

Kết quả:

Number of row: 3
Number of column: 4
A[0][0] = -2.3
A[0][1] = 3.4
A[0][2] = 5.6
A[0][3] = 5
A[1][0] = 23
A[1][1] = 12
A[1][2] = -3
A[1][3] = 10
A[2][0] = 9.2
A[2][1] = -4.5
A[2][2] = 6.5
A[2][3] = 3.6
A =
        -2.30           3.40            5.60            5.00
        23.00           12.00           -3.00           10.00
        9.20            -4.50           6.50            3.60
Average of positive elements in matrix: 8.811110

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