初始化后的數組值不相同

Question

我已經用C語言編寫了一段代碼，其中我使用隨機數/字符初始化了一個數組。 但是，當我在初始化后打印數組值時，我看到每個索引上的值都等於最后分配的值（最后一個索引的值）。 請告訴我代碼中的問題是什么？

碼：

#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;
}

輸出：

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

您將數組元素的所有元素初始化為save到同一指針的元素，因此使用它們中的任何內容將看到的都是相同的。

在這種情況下，建議您像這樣直接將數據存儲在save ：

#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;
}