[Segmentation Fault] Oops! The filename points to a constant string

原创于 2013-02-24 15:49:43 发布 · 437 阅读

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#Pointer to a Constan #Segmentation fault #segmentation fault #Segmentation Fault

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本文通过一个简单的C语言程序示例介绍了尝试修改常量字符串时导致的段错误。该程序尝试通过scanf函数修改一个初始化为常量字符串的指针变量，这违反了常量内存区域的保护机制。

We can compile the following program using the gcc compiler.

But when running it, we get a segmentation fault.

Why ?

#include <stdio.h>
int main()
{
  // The following statement is equal to " constant char* filename = "file1.txt"; "in c++
  char* filename = "file1.txt"; // Initialization and after that filename points to a constant string.
  printf("\nPlease input for the filename ==> ");
  scanf("%s", filename); // Try to modify a constant string. It will cause a segmentation fault !
  printf("\nThe file name you have input is %s", filename);
  return 0;
}