c - C语言中如何用scanf读取字符？获取格式为 [-Wformat=] 的 "spurious trailing ‘%’”

Question

当我尝试编译时，我收到以下警告:

warning: spurious trailing ‘%’ in format [-Wformat=]

warning: too many arguments for format [-Wformat-extra-args]

这是导致问题的部分:

char drop, sub;

printf("Please enter a character to be dropped.\n");

scanf(" c%", &drop);

printf("Please enter a character to be subbed.\n");

scanf(" c%", &sub);

任何和所有的帮助将不胜感激!

Answer 1

scanf("%c", &drop);//---> correct usage

您正在读取一个字符。

使用正确的格式说明符将字符变量的地址传递给 scanf 函数。