Question

我似乎得到第一个矩阵的输入，但是当我要求用户输入第二个矩阵的输入时，程序崩溃了......为什么这个？无法弄清楚，我甚至尝试分配记忆，结果是一样的......

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

#define MAXCOLUMNS 10 

// dealing with 2D arrays, passing to function etc
void read_input(int (*a)[MAXCOLUMNS], int n_rows, int n_columns);
void print_sum (int (*a)[MAXCOLUMNS], int (*b)[MAXCOLUMNS], int (*c)[MAXCOLUMNS], int    n_rows, int n_columns);

int main() {
    int i;
    int rows;
    int columns;

    int (*two_d_array)[MAXCOLUMNS];
    int (*two_d_array2)[MAXCOLUMNS];    
    int (*output)[MAXCOLUMNS];

    printf("enter the number of rows\n");
    scanf("%d", &rows);

    printf("enter the number of columns\n");
    scanf("%d", &columns);

    printf("enter data into array number 1\n");
    read_input(two_d_array, rows, columns);

    printf("enter data for 2d array number 2\n");
    read_input(two_d_array2, rows, columns);

    print_sum(two_d_array, two_d_array2, output, rows, columns);

    return 0;
}

void read_input(int (*a)[MAXCOLUMNS], int n_rows, int n_columns) {
    int i;
    int j;

    for (i = 0; i < n_rows; ++i) {
        for (j = 0; j < n_columns; ++j) {
            printf("enter details for rows number %d and column number %d\n", i + 1, j + 1);
            scanf("%d", (*(a+i)+j));
            getchar();
        }
    }   
}

void print_sum (int (*a)[MAXCOLUMNS], int (*b)[MAXCOLUMNS], int (*c)[MAXCOLUMNS], int n_rows, int n_columns) {
    int i;
    int j;

    // computing sum
    for (i = 0; i < n_rows; i++) {
        for (j = 0; j < n_columns; j++) {
            *(*(c+i)+j) = *(*(a+i)+j) + *(*(b+i)+j);
        }
    }

    // printing sum
    for (i = 0; i < n_rows; i++) {
        printf("\n");
        for (j = 0; j < n_columns; j++) {
            printf("%d\t", *(*(c+i)+j));
        }
    }
}

Answer 1

代表C99

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

#define MAXCOLUMNS 10 

void read_input(int rows, int cols, int a[rows][cols]);
void print_sum (int rows, int cols, int in1[rows][cols], int in2[rows][cols], int out[rows][cols]);

int main(void) {
    int i, rows, columns;

    printf("enter the number of rows\n");
    scanf("%d", &rows);

    printf("enter the number of columns\n");
    scanf("%d", &columns);
    //if(columns > MAXCOLUMNS){ fprintf(stderr, "too large!"); return 1); }
    int array1[rows][columns];
    int array2[rows][columns];
    int array3[rows][columns];

    printf("enter data into array number 1\n");
    read_input(rows, columns, array1);

    printf("enter data for 2d array number 2\n");
    read_input(rows, columns, array2);

    print_sum(rows, columns, array1, array2, array3);

    return 0;
}

void read_input(int rows, int cols, int a[rows][cols]){
    int i, j;

    for (i = 0; i < rows; ++i) {
        for (j = 0; j < cols; ++j) {
            printf("enter details for rows number %d and column number %d\n", i + 1, j + 1);
            scanf("%d", &a[i][j]);
        }
    }   
}

void print_sum (int rows, int cols, int a[rows][cols], int b[rows][cols], int c[rows][cols]){
    int i, j;

    for (i = 0; i < rows; i++){
        printf("\n");,,
        for (j = 0; j < cols; j++){
            c[i][j] = a[i][j]  + b[i][j];
            printf("%d\t", c[i][j]);
        }
    }
}

for int **（2D_ARRAY）

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

int main(void){
    int rows = 3;
    int cols = 5;
    int **array;
    int r, c;
    //allocate
    array = malloc(rows * sizeof(int*));
    for(r = 0; r < rows ; ++r){
        array[r] = malloc(cols * sizeof(int));
    }
    //set
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            array[r][c] = r * 10 + c;
        }
    }
    //print
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            printf("%02d ", array[r][c]);
        }
        printf("\n");
    }
}

表示int（**）[SIZE]

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

#define MAX 10

int main(void){
    int rows = 3;
    int cols = 5;
    int (**array)[MAX];
    int r, c;
    //allocate
    array = malloc(rows * sizeof(int (*)[MAX]));
    for(r = 0; r < rows ; ++r){
        array[r] = malloc(sizeof(int[MAX]));
    }
    //set
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            (*array[r])[c] = r * 10 + c;
        }
    }
    //print
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            printf("%02d ", (*array[r])[c]);
        }
        printf("\n");
    }
}

for int（*）[SIZE]

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

#define MAX 10

int main(void){
    int rows = 3;
    int cols = 5;
    int (*array)[MAX];
    int r, c;
    //allocate
    array = malloc(rows * sizeof(int[MAX]));
    //set
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            array[r][c] = r * 10 + c;
        }
    }
    //print
    for(r = 0; r < rows ; ++r){
        for(c = 0; c < cols ; ++c){
            printf("%02d ", array[r][c]);
        }
        printf("\n");
    }
}

无法使用多维数组添加两个矩阵

1 个答案: