linux c 的main 函数中的return 和 查看返回参数 argv 与 argc

#include <stdio.h>

int main(int argv,char* argc[])
{
    printf("hello word!n");
    return 0;
}

gcc hello.c -o main.out && ./main.out

echo $?  

#include <stdio.h>

int main(int argv,char* argc[])
{
    printf("argv is %dn",argv);
    return 0;
}

[[email?protected] les3]# gcc main.c -o m2.out
[[email?protected] les3]# ls
m2.out  main.c  main.out
[[email?protected] les3]# ./m2.out -l -a
argv is 3
[[email?protected] les3]# ./m2.out -l
argv is 2

#include <stdio.h>

int main(int argv,argv);
    int i;
    for(i=0;i<argv;i++)
    {
        printf("argc[%d] is %sn",i,argc[i]);
    }
    return 0;
}

[[email?protected] les3]# gcc main.c -o m3.out
[[email?protected] les3]# ls
m2.out  m3.out  main.c  main.out
[[email?protected] les3]# ./m3.out -l -a asdfasf fdsaf
argv is 5
argc[0] is ./m3.out
argc[1] is -l
argc[2] is -a
argc[3] is asdfasf
argc[4] is fdsaf