Question

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void matrixRandomFill(int size, int size2, int matrix[size][size2]) {
    srand(time(NULL));

    for ( int i = 0; i < size; i++ ) {
        for ( int j = 0; j < size2; j++ ) {
            matrix[i][j] = rand() % 9;
        }
    }
}

void matrixSum(int size, int size2, int matrix1[size][size2], int matrix2[size]    [size2], int matrixSum[size][size2]) {
    for ( int i = 0; i < size; i++ ) {
        for ( int j = 0; j < size2; j++ ) {
            matrixSum[i][j] = matrix1[i][j] + matrix2[i][j];
        }
    }
}

void matrixSubstract(int size, int size2, int matrix1[size][size2], int matrix2[size]    [size2], int matrixSubstract[size][size2]) {
    for ( int i = 0; i < size; i++ ) {
        for ( int j = 0; j < size2; j++ ) {
            matrixSubstract[i][j] = matrix1[i][j] - matrix2[i][j];
        }
    }
}

void matrixMultiply(int size, int size2, int matrix1[size][size2], int matrix2[size]    [size2], int matrixMultiply[size][size2]) {
    for ( int i = 0; i < size; i++ ) {
        for ( int j = 0; j < size2; j++ ) {
            matrixMultiply[i][j] = matrix1[i][j] * matrix2[i][j];
        }
    }
}

void matrixPrint(int size, int size2, int matrix[size][size2]) {
    for ( int i = 0; i < size; i++ ) {
        for ( int j = 0; j < size2; j++ ) {
            printf("%2d ", matrix[i][j]);
        }
        printf("\n");
    }
}

int main() {
    int size;
    printf("Enter matrix size NxN: ");
    scanf("%d", &size);

    int matrix1[size][size];
    int matrix2[size][size];
    int matrixSum[size][size];
    int matrixSubstract[size][size];
    int matrixMultiply[size][size];

    matrixRandomFill(size, size, matrix1);
    matrixRandomFill(size, size, matrix2);

    printf("Printing first matrix:\n");
    matrixPrint(size, size, matrix1);
    printf("--------------------------------------\n");

    printf("Printing second matrix:\n");
    matrixPrint(size, size, matrix2);
    printf("--------------------------------------\n");

    printf("Printing matrix1 + matrix2:\n");
    matrixPrint(size, size, matrixSum);
    printf("--------------------------------------\n");

    printf("Printing matrix1 - matrix2:\n");
    matrixPrint(size, size, matrixSubstract);
    printf("--------------------------------------\n");

    printf("Printing matrix1 * matrix2:\n");
    matrixPrint(size, size, matrixMultiply);
    printf("--------------------------------------\n");

    return 0;
}

函数看起来很正常，但我不断得到这样的东西：打印矩阵1 +矩阵2： 0 0 0 0 0 0 0 0 0

或

打印矩阵1 - 矩阵2： -1761243347 32767 -1761341440 32767 0 0 0 0 0

看起来像某种分段错误，但我无法弄清楚我犯了哪个错误。

Answer 1

问题是你只是打印矩阵而不是在它之前执行任何操作。

// You forgot to call matrix sum function here.

printf("Printing matrix1 + matrix2:\n");
matrixPrint(size, size, matrixSum);
printf("--------------------------------------\n");

类似于减法，乘法运算。

Answer 2

你的函数matrixSum等永远不会被调用。

Answer 3

正如其他人所说，你从来没有真正评估过matrixSum和其他的，我发现你的本地（对主要）变量与你的函数同名隐藏了你的函数，所以它们将不再可用于那些变量声明

我看到你的另一个问题的方式是（例如）：

int iwilldosomething(int a, int b) /*function iwilldosomething */

int main(void)
{
  int iwilldosomething;     /* local variable iwilldosomething */
  iwilldosomething(2, 3);    /* here you will get error, because main can see iwilldosomething and will tell that iwilldosomething is not a function */
.
.
.

使用C中的方阵找到函数中的误差（sum，subtract，multiply）

3 个答案: