error: 'for' loop initial declarations are only allowed in C99 mode

使用gcc编译代码是报出

note: use option -std=c99 or -std=gnu99 to compile your code

错误，这是因为在gcc中直接在for循环中初始化了增量：

for(int i=0; i<10; i++)
{
}

这语法在gcc中是错误的，必须先先定义i变量：

int i;
for(i=0; i<10; i++)
{}

这是因为gcc基于c89标准，换成C99标准就可以在for循环内定义i变量了：

gcc src.c -std=c99 -o src

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