实验一

make clean
make
./calculator
clear

实验二

gcc main.c -o main
./main

实验三

make clean
make
./fact
clear

实验四

gcc -o shmread shmread.c -lm
gcc -o shmwrite shmwrite.c -lm
./shmread &
./shmwrite

gcc -std=c99 -o lvyou lvyou.c
./lvyou