1F - A+B for Input-Output Practice (III)

Your task is to Calculate a + b.

Input

Input contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.

Output

For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.

Sample Input

1 5
10 20
0 0

Sample Output

6
30

// 先上代码对比

 #include<stdio.h>
 int main()
 {
     int a, b, t, i;
     while(scanf("%d %d", &a, &b), a!=&&b!=)
         printf("%d\n", a+b);
     return ;
 }

WA

 #include<stdio.h>
 int main()
 {
     int a, b, t, i;
     while(scanf("%d %d", &a, &b), !(a==&&b==))
         printf("%d\n", a+b);
     return ;
 }

AC

//

	a!=0 && b!=0	!(a==0 && b==0)
a真b真	真	真
a真b假	假	真
a假b真	假	真
a假b假	假	假

// !(a==0&&b==0) <=> a||b
// 插入补充：命名文件时不要用空格！！！
　　例如：一开始我把WA的文件命名为“F”，把AC的文件命名为“F test”. 结果运行“F test”的结果和“F”的一样.
　　后来我运行了如下代码

 #include<stdio.h>
 int main()
 {
     int a=, b=;
     while(a!=&&b!=)
     {
         printf("%d\n", a+b);
     }
     return ;
 }

F test2

　　结果还是和“F”一样！！！大概执行程序的时候读程序名读到空格就结束吧