linux编译运行c,c++,java

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linux编译运行c,c++,java

运行C

  1. 安装gcc
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[root@localhost ~]# yum install gcc
  1. 就地写一个C程序
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[root@localhost ~]# vi hello.c

#include<stdio.h>
int main(){
        int n;
        int sum=0;
        scanf("%d",&n);
        for(int i=1;i<=n;i++){
                sum+=1;
        }
        printf("sum is %d\n",sum);
        return 0;
}
  1. 编译输出为hello.out
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[root@localhost ~]# gcc hello.c
hello.c: In function ‘main’:
hello.c:6:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=1;i<=n;i++){
  ^
hello.c:6:2: note: use option -std=c99 or -std=gnu99 to compile your code
[root@localhost ~]# gcc -std=c99 hello.c -o hello.out
[root@localhost ~]# ls
anaconda-ks.cfg  hello.c  hello.out  mysql-8.0.22-1.el7.x86_64.rpm-bundle.tar
  1. 运行
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[root@localhost ~]# ./hello.out
12
sum is 12

运行C++

  1. 安装gcc-c++
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[root@localhost ~]# yum install gcc-c++
  1. 就地写一个C++程序
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[root@localhost ~]# vi hello.cpp


#include<iostream>
#include<algorithm>
using namespace std;

int main(){
        int s[10];
        for(int i=0;i<5;i++){
                cin>>s[i];
        }
        sort(s,s+5);
        for(int i=0;i<5;i++){
                if(i) cout<<" ";
                cout<<s[i];
        }
        cout<<endl;
        return 0;
}
  1. 编译
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[root@localhost ~]# g++ hello.cpp -o hellocpp.out
[root@localhost ~]# ls
anaconda-ks.cfg  hello.c  hello.cpp  hellocpp.out  hello.out  mysql-8.0.22-1.el7.x86_64.rpm-bundle.tar
  1. 运行
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[root@localhost ~]# ./hellocpp.out 
12 32 535 6 34
6 12 32 34 535

运行java

jdk包名：jdk-15.0.1_linux-x64_bin.tar.gz

  1. java环境文件丢到/lib
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[root@localhost ~]# mkdir /lib/java
[root@localhost ~]# mv ./jdk-15.0.1_linux-x64_bin.tar.gz /lib/java
[root@localhost ~]# cd /lib/java
[root@localhost java]# ls
jdk-15.0.1_linux-x64_bin.tar.gz
[root@localhost java]# tar -zxvf jdk-15.0.1_linux-x64_bin.tar.gz 
jdk-15.0.1/bin/jaotc
jdk-15.0.1/bin/jar
...
  1. 配置全局变量
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[root@localhost java]# vi  /etc/profile

# shift+g 末尾加入

export JAVA_HOME=/lib/java/jdk-15.0.1
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib
: wq
  1. 重新导入变量
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[root@localhost java]# source /etc/profile
[root@localhost java]# java -version
java version "15.0.1" 2020-10-20
Java(TM) SE Runtime Environment (build 15.0.1+9-18)
Java HotSpot(TM) 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing)
  1. 就地写一个java程序
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[root@localhost java]# vi hello.java
    
import java.util.Scanner;
public class hello{

        public static void main(String args[]){
            Scanner scan = new Scanner(System.in);
            System.out.println("next");
            if (scan.hasNext()){
                String  str1=scan.next();
                System.out.println("输入的数据为："+str1);
            }
        	scan.close();
        }
}
  1. 编译运行
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[root@localhost ~]# javac hello.java
[root@localhost ~]# java hello
next
asd
输入的数据为：asd
  1. 依赖库

全局的库路径在/lib64，用户库路径/usr/lib64