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[英]Why is my program printing out this message twice in this particular situation?
[英]Why is my string printing out twice?
我想創建一個隨機字符串的游戲,用戶必須猜測原始字符串是什么,但是當我顯示隨機字符串時,它將打印兩次。 一次隨機化一次不隨機化 這是我的代碼:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int checkWin(char guess[], char word[]);
void jumble(char array[]);
int main()
{
srand(time(NULL));
char word[5] = {'h', 'e', 'l', 'l', 'o'};
char scramble[5] = {'h', 'e', 'l', 'l', 'o'};
char guess[5];
jumble(scramble);
printf("The jumled word is: %s\n",scramble);
printf("Enter a guess: ");
for(int i = 0; i < 5; i ++)
{
scanf(" %c",&guess[i]);
}
printf("\n");
if(checkWin(guess,word))
printf("You win!");
else
printf("You lose");
}
void jumble(char array[])
{
int a,b,c;
for(a = 1; a<6; a++)
{
b = rand()%5;
c = rand() %5;
if(b==c)
{
a--;
continue;
}
char temp = array[b];
array[b] = array[c];
array[c] = temp;
}
}
int checkWin(char guess[], char word[])
{
int a = 0;
for(int i = 0; i < 5; i ++)
{
if(guess[i] == word[i])
a++;
}
if(a==5)
return 1;
else
return 0;
}
當用戶猜測字符串時,它工作正常,但是當我嘗試顯示混亂的字符串時,我得到類似以下內容:
The jumled word is: ollehhello"
Enter a guess: hello
You win!
Process returned 0 (0x0) execution time : 9.645 s
Press any key to continue.
我不知道這是怎么回事字符串,所以任何幫助將不勝感激。
您的字符串不是NUL
終止的,因此%s
格式代碼會同時在這兩個字符串中運行(如果不需要對齊填充,通常會背對背布置堆棧變量,盡管這並不是標准所保證的)最終找到一個巧合的NUL
字節(在另一個編譯器上,它可能會打印出更多的亂碼或崩潰)。
要解決此問題,請使用字符串文字(隱式地添加\\0
),手動添加\\0
或將它們的大小設置為比您初始化的大小大(額外的元素隱式地為零),例如:
// Not declaring sizes; the arrays size based on the literal to size 6
char word[] = "hello";
char scramble[] = "hello";
要么
// Again, autosizing to 6
char word[] = {'h', 'e', 'l', 'l', 'o', '\0'};
char scramble[] = {'h', 'e', 'l', 'l', 'o', '\0'};
要么
// Explicit sizing to 6, implicit initialization of uninitialized element to 0
char word[6] = {'h', 'e', 'l', 'l', 'o'};
char scramble[6] = {'h', 'e', 'l', 'l', 'o'};
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