c - 如何解决编译以下代码时出现的堆栈粉碎错误？

Question

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main()
{
    char a[20];
    int b;
    printf("\n enter your name");
    a[20]=getchar();
    printf("\n enter your password");
    scanf("%d",&b);
    if (a=="ilangeeran")
    {
        printf("\n login successful");
    }
}

这是示例程序，在编译时会出现堆栈粉碎错误，该如何解决？

最佳答案

您对a的声明指定了一个20个字符的数组：从a[0]到a[19]。 a[20]超出范围：a[20]=getchar();。

getchar返回int。这样做是为了将非字符EOF值与有效字符值区分开。任何正返回值都是一个字符。任何负值都是错误...但是您需要将返回值存储在int中，并检查int是否为负值，以便处理错误！

int c = getchar();
if (c < 0) {
    fputs("Read error while reading from stdin", stderr);
    return EXIT_FAILURE;
}
a[19] = c; /* Don't rely on this being a string, since a string is a sequence of
            * characters ending at the first '\0' and this doesn't have a '\0'.
            * Hence, it isn't a string. Don't pass it to any str* functions! */

同样，您可能应该处理来自scanf的错误：

switch (scanf("%d", &b)) {
    case 1: /* excellent! 1 means that one variable was successfully assigned a value. */
            break;
    case 0: fputs("Unexpected input while reading from stdin; "
                  "The \"%d\" format specifier corresponds to decimal digits.", stderr);
            return EXIT_FAILURE;
    default: fputs("Read error while reading from stdin", stderr);
             return EXIT_FAILURE;
}

if (a=="ilangeeran")是废话。您正在读哪本书？

关于c - 如何解决编译以下代码时出现的堆栈粉碎错误？ ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15698175/

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Answer 1

您对a的声明指定了一个20个字符的数组：从a[0]到a[19]。 a[20]超出范围：a[20]=getchar();。

getchar返回int。这样做是为了将非字符EOF值与有效字符值区分开。任何正返回值都是一个字符。任何负值都是错误...但是您需要将返回值存储在int中，并检查int是否为负值，以便处理错误！

int c = getchar();
if (c < 0) {
    fputs("Read error while reading from stdin", stderr);
    return EXIT_FAILURE;
}
a[19] = c; /* Don't rely on this being a string, since a string is a sequence of
            * characters ending at the first '\0' and this doesn't have a '\0'.
            * Hence, it isn't a string. Don't pass it to any str* functions! */

同样，您可能应该处理来自scanf的错误：

switch (scanf("%d", &b)) {
    case 1: /* excellent! 1 means that one variable was successfully assigned a value. */
            break;
    case 0: fputs("Unexpected input while reading from stdin; "
                  "The \"%d\" format specifier corresponds to decimal digits.", stderr);
            return EXIT_FAILURE;
    default: fputs("Read error while reading from stdin", stderr);
             return EXIT_FAILURE;
}

if (a=="ilangeeran")是废话。您正在读哪本书？