c/c++语言开发共享C – 在函数中使用fgets（）从stdin读取行

问题是您尝试写入str指针指向的位置。 最初它会指向一些垃圾地址（由于char *str没有被初始化）。

您可以尝试通过更改以下基于堆栈的解决方案：

 /* This is just a pointer */ char *str; 

至：

 /* This is a character array (on the stack) of size MAX_SIZE, initialized to zero */ char str[MAX_SIZE] = {0}; 

或者，如果要为数组动态分配内存，请执行以下操作：

 char *str; str = calloc(1, MAX_SIZE); if (str == NULL) { /* Failed to allocate memory */ } ... Your code free(str); /* You should always free dynamically allocated memory when you are done with it */ str = NULL; /* It's a good practice to point your pointer to NULL after it's free'd */ 

不要忘记数组索引从0开始并转到MAX_SIZE - 1 （在您的情况下）和NUL终止（字符串必须以它结束）。

 #include  #include  #include  #define MAX_SIZE 1025 int print_select(); /* Use correct name (instead of print_fgets()) */ int main() { print_select(); return 0; } int print_select() /* Fix. Dhould return int if you have a return  statement. */ { char str[MAX_SIZE]; /* Initialize static memory. */ int length; while (fgets( str, MAX_SIZE, stdin)!=NULL) { length=strlen(str); if (length==MAX_SIZE-1 && str[length-1]!='n') { printf("Error, line overeached buffer!n"); return 1; } if (str[length-1]=='n') { str[length-1]=''; } printf("%sn", str); } return 0; /* Function may not be returning an int. Return it in those cases. */ }