C language: 11. Pipeline

1、linux Pipeline introduction

see /etc/ Does the following include ab Character file
ls /etc/ | grep ab
The essence of the above order is to ls The output stream of the command is as grep Input stream of command

2、c Examples of language use pipelines

/avg.c
avg.c It mainly calculates the average value of two numbers

#include <stdio.h>
int main()
{
    
    int sum,num;
    scanf("%d,%d", &sum,&num);
    float result = sum/num;
    printf("result=%f\n", result);
    return 0;
}

/input.c
input.c It mainly counts the sum and quantity of all the input figures

#include <stdio.h>
int main()
{
    
    int flag=1;
    int i;
    int count=0;
    int s=0;
    while(flag){
    
        scanf("%d", &i);
        if(0==i) break;
        count++;
        s+=i;
    }
    printf("%d,%d\n", s, count);
    return 0;
}

avg.c and input.c Use pipes in series , Calculation 3000+2000 Average value