如何用用户输入值填充C中的2D数组? [英] How to fill a 2D array in C with user input values?

问题描述

注意:这是一个家庭作业问题.

Note: This is a homework question.

使用FOR构造将2D板的值填充为用户.程序要求输入电路板尺寸n，m，然后要求每一个板值.

Use FOR construction to fill 2D board with values that were given by user. The program asks for board size n, m and then it asks for each board value.

我的尝试

#include <stdio.h>
int main(){
    printf("Enter the number of columns");
    int i = scanf("%d",&i);
    printf("Enter the number of rows");
    int y = scanf("%d",&y);

    int r[i][y];
    int a;
    int b;
    for (a=0; a<i; a++){
        for(b=0; b<y; b++){
            int r[a][b] = scanf("%d",&a,&b); //bug
        }
    }
}

错误:c:13可变大小的对象可能未初始化

#include <stdio.h>

int main(){

    printf("Enter the number of columns");
    int i; 
    scanf("%d", &i);
    printf("Enter the number of rows");
    int y; 
    scanf("%d", &y);

    int r[i][y];
    int a;
    int b;

        for (a=0; a<i; a++){
            for (b=0; b<y; b++){
    scanf("%d",&r[a][b]);
        }
    }
}

推荐答案

scanf 获取要读取的变量的地址，并返回读取的项目数.它不会返回读取的值.

scanf takes the address of the variable that is being read and returns the number of items read. It does not return the value read.

替换

int i = scanf("%d",&i);
int y = scanf("%d",&y);

作者

scanf("%d",&i);
scanf("%d",&y);

和

int r[a][b] = scanf("%d",&a,&b);

作者

scanf("%d",&r[a][b]);

您在程序中使用的是可变长度数组(VLA):

int r[i][y];

as i 和 y 不是常量，而是变量.VLA是C99的标准功能.

as i and y are not constants and are variables. VLA are a C99 standard feature.

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