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c - 运行时错误: Corrupted Variable

转载 作者:行者123 更新时间:2023-11-30 19:20:53 27 4
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我已经搞乱了我的代码有一段时间了......现在当我运行它并在菜单中单击第二个选项时,当我输入超过 15 个字符的密码时,我收到此错误?谁能看到我做错了什么?这可能是一些我无法发现的小事谢谢

错误:

运行时检查失败 #2 - 变量“passwordCheck”周围的堆栈已损坏。

代码:

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


FILE*fp;

char *symbols = "#~!$%^&*()+=<>?/@"; // Random Symbol is generated form this list

int main(void) {

char password[4 + 4 + 2 + 2 + 1]; // 4 Upper, 4 Lower, 2 Num, 2 Symbols
int i, j=0, len=sizeof(password)-1;
int menuNum = 0;
char passwordCheck[15+1]; // for checking password length



fp = fopen("passwords.txt", "a+"); //Opens the text file to save the Passwords

srand(time(NULL));
printf(" Main Menu\n");
printf("********************************\n");
printf("\nEnter 1 to Generate a New Password: ");
printf("\n\n");
printf("Enter 2 to Check Old Passwords: ");
printf("\n\n");
printf("Enter 3 to Exit. ");
printf("\n\n");
scanf("%d", &menuNum); // Reads number

if (menuNum == 1) // If 1 is entered on the Menu...
{
printf("********************************\n");
printf("\nYour New Password is: \n\n");

// Each Password will Have 12 Characters(4 Uppercase letters, 4 Lowercase letters, 2 Numbers & 2 Symbols)

for (i = 0; i < 4; ++i)
password[j++] = 'a' + rand() % ('z' - 'a' + 1); // Generates 4 random Lowercase characters

for (i = 0; i < 4; ++i)
password[j++] = 'A' + rand() % ('Z' - 'A' + 1); // Generates 4 random Uppercase characters

for (i = 0; i < 2; ++i)
password[j++] = '0' + rand() % ('0' - '9' + 1); // Generates 2 random numbers

for (i = 0; i < 2; ++i)
password[j++] = symbols[rand() % strlen(symbols)]; // Generates 2 random symbols

password[j] = '\0';
for(i = 0; i < sizeof(password)-1; ++i)
{
char c = password[i];
j = rand() % len;
password[i] = password[j];
password[j] = c;
} // Shuffles passwords Characters

printf("%s\n\n", password);
printf("********************************\n");
fprintf(fp, "\n%s", password); // Outputs the Generated Passoword to the text file
fclose(fp); // Closes the text file
system("pause");
}

else if (menuNum == 2)// If 2 is entered on the Menu...
{
printf("\nEnter your password for checking: ");
scanf("%s", passwordCheck); // Reads password
if (strlen(passwordCheck) > 15) // Checks length of Password
{
printf("'%s' is too long. Needs to be less then 15 Characters\n", passwordCheck);
system("pause");
}
else if (strlen(passwordCheck) < 9) // Checks length of Password
{
printf("'%s' is too short. Needs to be more then 9 Characters\n", passwordCheck);
system("pause");
}
}

}

最佳答案

您定义字符密码[13]。这对于 12 个字符加上一个空终止符来说已经足够了。

任何对 password[13]password[14] 等进行索引的尝试都是未定义的行为,也是堆栈损坏的原因。类似地,对于passwordCheck[]:您的scanf调用可能超出了声明的空间; strlen 在这里没有帮助,因为它会愉快地计数到第一个空终止符。

关于c - 运行时错误: Corrupted Variable,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20953339/

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