错误使用C处理？如何处理scanf函数和非法字符？ [英] Error Handling in C? How to deal with scanf and illegal characters?

问题描述

我用C写一个程序，错误处理它会告诉你去寻找非法字符，当你scanf函数-ING。换句话说，查找的字符不是一个整数。
它应该显示相应的错误消息并终止程序。

I'm writing a program in C, and for error handling it tells you to look for an illegal character when you're scanf-ing. In other words, look for a character that isn't an integer. It is supposed to display an appropriate error message and terminate the program.

我，我怎么去寻找非法字符，或者注意到，它不是一个整数，有点困惑。任何帮助吗？

I'm a little confused as to how I go about looking for that illegal character, or noticing that it isn't an integer. Any help?

推荐答案

scanf（）的返回成功参数的个数。如果你这样做：

scanf() returns the number of successful arguments. If you do:

int ivar, return_val;
return_val = scanf("%i", &ivar);

RETURN_VAL 应该是1,1参数的原因（伊娃）。检查用户输入：

return_val should be 1, cause of 1 parameter (ivar). Check the user input:

if (return_val == 1) {
    // right input
} else {
    // wrong input
}

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