每日心得

2012 - 5 - 10

cmd pipe 标准输入输出通道

today i realized that '>' and '<' in command line (cmd) we can output or input data . so can we test the program . as the example bellow : there fies : test.c in.txt out.txt test.c:

#include <stdio.h>
int main()
{
    int a ;
    scanf("%d",&a) ;
    printf("%d\n",a+1) ;
    return 0 ;
}

in.txt :

  1000

out.txt (nothing)

compile the test.c in the command line like this :

    gcc test.c

then a.exe generated . the last thing to do is , typein the command :

    a.exe <in.txt >out.txt

when it finished , you can see the result in out.txt .

    1001

in the vc++6.0 , you can create the input file in the project folder , setting as project -> project setting -> debug -> debug arguement , add

    <in.txt