12.1

Topic 12.1 Find the mistake(s) in the following code:

unsigned int i;

For(i=100;i>=0; --i)

 Printf(“%d\n”,i);

// Two mistakes:

1)  Unsigned int is always >=0.
虽然打0正确，但循环永远不会结束。

If truly wanted to print zero, should add an additional printf after the for loop

2)  If print unsigned int, we should use %u

方法1：unsigned
inti;

       
for(i=100;i>0;--i)

            printf("%u\n",i);

方法2：inti;

       
for(i=100;i>=0;--i)

             printf("%d\n",i);//
输出100到0的数