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Since scanf returns the value EOF (which is -1) on end of file, the loop as written is correct. It runs as long as the input contains text that matches %d, and stops either at the first non-match or end of file. It would have been clearer at a glance if scanf were expecting more than one input.... while (scanf("%d %d", &x, &y)==2) { ...
while(scanf("%d",&n)!=EOF) can also be expressed as while(~scanf("%d",&n)); ... Intelligent Recommendation. while&&for. Circulating structure While cycle Do ... while loop FOR cycle Introduced in Java5 enhanced for loop for arrays While cycle While is the most basic loop, its structure is: As long as the Boolean expres...
利用是scanf()函数的返回值可以来检测和处理不匹配的输入。 ~是按位取反，-1的十六进制补码表示为0xffffffff，f是二进制的1111，取反后全部变为0，于是while结束，并且只有返回值为EOF（即-1）时，其取反值才为0，while循环才能结束。
EOF在scanf连用时代表-1的意思，当用到while(scanf()!=EOF)，代表的意思是一直输入，直到scanf返回的值是-1时才会停止输入，也可以在while里面加上一些约束条件，使输入在特定的条件下就会停止，也可以在输入完成后按下 ，Ctrl+z,可以强行停止输入。
scanf()函数返回成功赋值的数据项数，出错时则返回，EOF定义为-1。~是按位取反，-1十六进制补码表示为0x ffffffff，f是二进制的1111，取反后就全部变成0了，于是while结束。
Write a function to calculate the sum of a+b that can run in a loop, and it can be run in the following form Changing the judgment condition of the while statement to scanf("%d %d", &a,&... EOF and scanf return value
while(~scanf("%d", &n)) 意思就是当有值输入的时候，进入while，当没有值输入时就结束while。（输入了值，如果scanf成功读取了就返回1，取反的结果不为0，进入while；如果scanf没有成功读取，返回0，取反的结果不为0，进入while；如果没有输入，到达文件末尾则返回-1 ...
The scanf returns how many characters read in stdin. It works correctly. If you enter a single integer then the scanf will wait for the second integer argument. You are entering more than two integers but your scanf reads only the first two integers. So, it returns two and your loop will not be terminate.
If successful, scanf returns the number of arguments successfully assigned. If a failure in MATCHING occurs before the first argument is assigned, scanf returns 0 and if INPUT failure occurs before the first argument is assigned, EOF is returned.
因为读到文件的结束符时，scanf返回值是EOF，也就是-1，而~(-1)的作用就是对-1的按位取反。 在计算机中，数字按补码存储，正数的补码和原码一样，负数的补码是其反码+1，反码也就是符号位仍为1，其它是原码取反。