c - For 循环未按预期工作

Question

我一直在尝试用 C 语言创建一个密码生成器。

除了实际的加密循环计数器之外，一切都工作得很好。它总是停在 39 左右。强制它进一步只会导致出现一些随机 ASCII 符号，而不是 A-Z。 (抱歉，我无法描述得特别清楚。)

#include <stdio.h>
#include <stdlib.h> /* For exit() function*/
#include <time.h>

#define SIZE 26
int main(){

    char plainAlphabet[27] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',' '};

    char cipherAlphabet[27];
    char plainText[] = "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG";

    int x = 0;
    int c = 0;

    int numbers[SIZE];
    int i, n, tmp;

    srand(time(NULL));

// Initialize the array
    for(i = 0;i < SIZE;++i)
    numbers[i] = i;

// Shuffle the array
    for(i = 0;i < SIZE;++i)
    {
        n = rand() % SIZE;
        tmp = numbers[n];
        numbers[n] = numbers[i];
        numbers[i] = tmp;
    } 

// Iterate through the array. Your numbers are already random
    for(i = 0;i < SIZE;++i){
        cipherAlphabet[i] = plainAlphabet[numbers[i]];
    };
    int a = 0;
    x = 0;
    i = 0;

    int z = strlen(plainText);
    printf("%d\n",z);
    for(plainText[x] != "^";c < z + 100; c++){

        if(plainAlphabet[c] == plainText["%d",x]){
            printf("%c",cipherAlphabet[c]);
            a = a + 1;
            x = x + 1;
            c = 0;
        };

    };
    printf("%d",c);
    printf("%d",z);
    scanf("%d", tmp);
    return 0;
}

(抱歉，如果它看起来很明显和/或重复。)

Answer 1

最后!它应该有效!您的主要/最大错误是在最后一个 for 循环中将 c 设置为 0!

因为将其设置为 0 后，它会增加 1，但在 plainAlphabet 中 'A' 是 索引 0 !因此，如果您的文本包含 A ，程序就会在那里停止，因为 c 它永远不会得到 0 而 A 会得到根本不可能在你的普通字母表中找到! (解决方案:将 c 设置为 -1 | 在我的示例中 c 是 arrayCount)

(您的代码中还有一些奇怪的错误!)

#include <stdio.h>
#include <stdlib.h> /* For exit() function*/
#include <time.h>
#include <string.h>

#define SIZE 26


int main() {

    char plainAlphabet[27] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' '};
    char cipherAlphabet[50];
    char plainText[255] = "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG";

    int arrayCount, randomNumber, swap, charCount = 0, strLength = strlen(plainText);
    int numbers[SIZE];


    srand(time(NULL));

    // Initialize the array
    for(arrayCount = 0; arrayCount < SIZE; arrayCount++)
        numbers[arrayCount] = arrayCount;

    // Shuffle the array
    for(arrayCount = 0; arrayCount < SIZE; arrayCount++) {
        randomNumber = rand() % SIZE;
        swap = numbers[randomNumber];
        numbers[randomNumber] = numbers[arrayCount];
        numbers[arrayCount] = swap;
    } 

    // Iterate through the array. Your numbers are already random
    for(arrayCount = 0; arrayCount < SIZE; arrayCount++)
        cipherAlphabet[arrayCount] = plainAlphabet[numbers[arrayCount]];


    printf("String Length: %d\n\n", strLength);
    printf("Encrypted Text: \n");
    charCount = 0;

    for(arrayCount = 0; arrayCount < strLength; arrayCount++) {

       if(plainAlphabet[arrayCount] == plainText[charCount] && plainText[arrayCount] != '^') {

           printf("%c", cipherAlphabet[arrayCount]);
           charCount += 1;
           arrayCount = -1;
        }

        if(plainText[charCount] == '\0')
            break;

    }

    int a = 0; //If this variable is commented out, the program gives other results

    printf("\n\n");
    system("pause");


    return 0;

}