在打印ANSI C一个char [英] Printing a char in ANSI C

问题描述

我用的getchar和的putChar到succeessfully打印我进入CHAR到屏幕前，但我已经改变了code稍微现在它打印我进入焦炭连续两次。 code：

I've used getchar and putchar to succeessfully print my entered char to the screen before, however I've changed the code slightly and now it prints my entered char twice in a row. Code:

#include <stdio.h>

int main()
{
    int charInput;
    printf("Enter a char >> ");
    charInput = getchar();
    printf("%c", putchar(charInput));

    return 0;
}

我知道我可以只使用的putchar没有printf的，但我想与他们进行实验。我得到的输出是：

I know I could just use putchar without the printf but I wanted to experiment with them. The output I get is:

Enter a char >> a
aa

2字符都显示在屏幕上？

2 chars are printed to the screen?

推荐答案

的putchar（charInput）将打印你的角色一次，然后将返回它的参数，
charInput 。然后，这将被传递给的printf ，这再次打印相同的字符。

putchar(charInput) will print your character once, and will then return its argument, charInput. This then gets passed to printf, which prints the same character again.

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