linux c of the main function and return to view the return parameters argc and argv effect

hello.c

#include <stdio.h>

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

 

&& direct role in running the compiled for the command connection

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

 

 

Then run to see the return parameters

echo $?  

 

argv role:

main.c file code

#include <stdio.h>

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

 

Compile and then run the first file  

[root@lyy les3]# gcc main.c -o m2.out
[root@lyy les3]# ls
m2.out  main.c  main.out
[root@lyy les3]# ./m2.out -l -a
argv is 3
[root@lyy les3]# ./m2.out -l
argv is 2

 

argc

main.c Code:

#include <stdio.h>

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

Compile and run the add parameters

[root@lyy les3]# gcc main.c -o m3.out
[root@lyy les3]# ls
m2.out  m3.out  main.c  main.out
[root@lyy 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