一、安裝前準備
1. gcc and g++分別是GNU的c & c++編譯器。

2. 官方網址：https://gcc.gnu.org/

3. 檢視是否安裝
[[email protected] ~]# gcc -v
-bash: gcc: command not found
[[email protected] ~]# g++ -v
-bash: g++: command not found
或者：
[[email protected] ~]# rpm -q gcc
package gcc is not installed
[[email protected] ~]# rpm -q gcc-c++
package gcc-c++ is not installed

二、安裝gcc、g++編譯器
1. 安裝gcc、g++
yum install gcc
yum install gcc-c++

2. 檢視是否安裝成功
[[email protected] ~]# rpm -q gcc
gcc-4.8.5-28.el7_5.1.x86_64
[[email protected] ~]# rpm -q gcc-c++
gcc-c++-4.8.5-28.el7_5.1.x86_64
或者：
[[email protected] ~]# which gcc
/usr/bin/gcc
[[email protected] ~]# which g++
/usr/bin/g++