Question

我用C语言编写了一段代码，其中我用随机数字/字符初始化一个数组。但是当我在初始化之后打印数组值时，我看到每个索引上的值等于最后指定的值（最后一个索引的值）。请告诉我代码中的问题是什么？

代码：

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


int main () {

    char *save[3][3] = { {" "," "," "}, {" "," "," "}, {" "," "," "} };
    char x[2] = {'\0', '\0'};
    int i, j, b;
    srand(time(NULL));

    printf("Assigned Values (initializing):\n");
    for(i=0; i<3; i++) {
        for(j=0; j<3; j++) {
            b = rand()%10;
            x[0] = b+'0';
            save[i][j] = x;
            printf("%s ",save[i][j]);
        }
    }

    printf("\n\nValues after initializing:\n");
    for(i=0; i<3; i++) {
        for(j=0; j<3; j++) {
            printf("%s ",save[i][j]);
        }
    }

    printf("\n\n");
    return 0;
}

输出：

Assigned Values (initializing):
1 5 9 8 5 7 5 4 1

Values after initializing:
1 1 1 1 1 1 1 1 1

Press any key to continue . . .

Answer 1

您已将数组save的所有元素元素初始化为同一指针，因此您可以使用其中任何一个元素看到的内容都是相同的。

在这种情况下，我建议您应该将数据直接存储在save中，如下所示：

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


int main (void) {

    char save[3][3][2] = { {" "," "," "}, {" "," "," "}, {" "," "," "} };
    int i, j, b;
    srand(time(NULL));

    printf("Assigned Values (initializing):\n");
    for(i=0; i<3; i++) {
        for(j=0; j<3; j++) {
            b = rand()%10;
            save[i][j][0] = b+'0';
            printf("%s ",save[i][j]);
        }
    }

    printf("\n\nValues after initializing:\n");
    for(i=0; i<3; i++) {
        for(j=0; j<3; j++) {
            printf("%s ",save[i][j]);
        }
    }

    printf("\n\n");
    return 0;
}

初始化后数组值不相同

1 个答案: