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在這個論壇上關於fgets（）有很多問題，但他們都沒有提供給我這個特定問題的答案。fgets（）邊界案例阻止等待輸入
我一直在刷新一些非常古老的C技巧，並一直遵循cprogramming.com上的教程。
我有課9（http://www.cprogramming.com/tutorial/c/lesson9.html）的文件string.h例如一個問題：
#include <stdio.h> /* stdin, printf, and fgets */
#include <string.h> /* for all the new-fangled string functions */
/* this function is designed to remove the newline from the end of a string
entered using fgets. Note that since we make this into its own function,
we could easily choose a better technique for removing the newline. Aren't
functions great? */
void strip_newline(char *str, int size)
{
int i;
/* remove the null terminator */
for ( i = 0; i < size; ++i)
{
if (str[i] == '\n')
{
str[i] = '\0';
/* we're done, so just exit the function by returning */
return;
}
}
/* if we get all the way to here, there must not have been a newline! */
}
int main()
{
char name[50];
char lastname[50];
char fullname[100]; /* Big enough to hold both name and lastname */
printf("Please enter your name: ");
fgets(name, 50, stdin);
/* see definition above */
strip_newline(name, 50);
/* strcmp returns zero when the two strings are equal */
if (strcmp (name, "Alex") == 0)
{
printf("That's my name too.\n");
}
else
{
printf("That's not my name.\n");
}
// Find the length of your name
printf("Your name is %d letters long", strlen (name));
printf("Enter your last name: ");
fgets(lastname, 50, stdin);
strip_newline(lastname, 50);
fullname[0] = '\0';
/* strcat will look for the \0 and add the second string starting at
that location */
strcat(fullname, name); /* Copy name into full name */
strcat(fullname, " "); /* Separate the names by a space */
strcat(fullname, lastname); /* Copy lastname onto the end of fullname */
printf("Your full name is %s\n",fullname);
getchar();
return 0;
}
這一切都可以很好地用於正常的情況下，但如果與fgets（輸入）是49個字符長 - 這應該允許，據我瞭解，鑑於緩衝區有50個插槽 - 第二次調用fgets（）不等待輸入。
我見過談調用與fgets（）之前清除緩衝區，但即使設置緩衝區的第一個字符（lastname[0] = '\0\不起作用的答案。
我敢肯定，我俯瞰在令人眼花繚亂的明顯，但如果有人可以把我從我的痛苦，我會非常感激。
非常感謝
彼得