为什么我的输出只有在它之后有另一个打印时才打印? [英] Why does my output only print if there is another print after it?

问题描述

这里有趣的小错误:

if (host != NULL) {
    printf("hi");
} else {
    printf("FAIL");
}
return 0;

根本不打印任何东西，但是:

doesn't print anything at all, but:

if (host != NULL) {
    printf("hi");
} else {
    printf("FAIL");
}   
fprintf(stdout, "\n%s\n", (char *)&additionalargs);
return 0;

印刷品

嗨

ABC

有人知道这是为什么吗?

Does anyone know why this is?

推荐答案

区别在于 \n 个字符.

The difference is the \n characters.

当您打印字符时，它们会累积在缓冲区中，该缓冲区在发送行尾"字符之前不会发送到输出设备.

As you printf characters, they are accumulated in a buffer which isn't sent to the output device until an 'end of line' character is sent.

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