初始化後數組值不相同

Question

我已經用C語言編寫了一段代碼，其中我正在用隨機數/字符初始化一個數組。但是當我在初始化數組值後打印數組值時，我發現每個索引值都等於上次賦值（最後一個索引值）。請告訴我的代碼有什麼問題？

代碼：

#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

您初始化爲相同的指針數組save元素的所有元素，所以你可以看到使用其中的任何將是相同的。

在這種情況下，我建議你應該將數據存儲直接在save這樣的：

#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; 
}