c - 计算字符的c程序中的段错误

Question

我是 C 的新手，正在尝试编写一个计算方括号、大括号、空格和换行的程序。编译器发出错误:打开文件时出错段错误(核心已转储)

#include <stdio.h>


int main(int argc, char *argv[])
 {
    FILE *fp;
    char c;
    int blank, tab, openbrace, closedbrace,openbracket,closedbracket, newline=0;


if ((fp = fopen("argv[0]", "r")) == NULL)
   {
     fprintf(stderr, "Error opening file");
    }
 while ((c=fgetc(fp)) != EOF)
 {
switch(c)
    {

        case '{':
        openbrace++;

        case '}':
        closedbrace++;

        case '[':
        openbracket++;

        case ']':
        closedbracket++;

        case '\n':
        newline++;


     }
   }
fclose(fp);
printf("\nThe number of { are %d", openbrace);
printf("\nThe number of } are %d", closedbrace);
printf("\nThe number of [ are %d", openbracket);
printf("\nThe number of ] are %d", closedbracket);
printf("\nThe number of new lines are %d", newline);
}

Answer 1

一些事情:

1) 出现错误后立即退出 - 不要继续。

2) 打开 argv 1 ，而不是“argv[0]”(argv[0] 包含 executable name ，并且您将其包含在字符串中)

fopen(argv[1], "r")

通过检查 argc 来确保 argv[1] 存在可能是个好主意。