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#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;
}

功能看起来很正常，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

或者

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

看起来像是某种分段错误，但我不知道我在哪里犯了错误。

4

3 回答 3

2

问题是您只是打印矩阵但没有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");

减法、乘法运算也是如此。

于 2013-09-01T14:51:41.643 回答
1

您的函数 matrixSum 等永远不会被调用。

于 2013-09-01T14:55:08.410 回答
1

正如其他人所说，您从未真正评估 matrixSum 和其余部分，我还发现与您的函数同名的本地（到主）变量隐藏了您的函数，因此它们在这些变量声明之后将不再可用。

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 */
.
.
.
于 2013-09-01T15:06:25.180 回答