------------------------------------------------------------------------------------

#include <stdio.h>

int main(int argc, char *argv[]){//(*argv[]==**argv)
    if(argc!=3){
        printf("Error: this program requires exactly two arguments\n");
        return 1;
    }
    // Convert the arguments from strings to integers
    
    int a=atoi(argv[1]);//ASCII to integer
    int b=atoi(argv[2]);

    int sum=a+b;
    printf("%d",sum);
}

------------------------------------------------------------------------------------

aadarsh@awsmblx550bs017:/tmp$ vi userspace.c
#include <stdio.h>
#include <stdint.h>

int main(int argc,char* argv[])
{
    int counter;
    printf("Argument count Is: %d\n",argc);
    printf("Program Name Is: %s\n",argv[0]);
    if(argc==1){
        printf("\nNo Extra Command Line Argument Passed Other Than Program Name");
    }
    if(argc>=2)
    {
        printf("\nNumber Of Arguments Passed: %d",argc);
        printf("\n----Following Are The Command Line Arguments Passed----");
        for(counter=0;counter<argc;counter++)
            printf("\nargv[%d]: %s",counter,argv[counter]);
    }
    return 0;
}


aadarsh@awsmblx550bs017:~$ cd /tmp/
aadarsh@awsmblx550bs017:/tmp$ ks
ks: command not found
aadarsh@awsmblx550bs017:/tmp$ vi userspace.c
aadarsh@awsmblx550bs017:/tmp$ make userspace
cc     userspace.c   -o userspace
aadarsh@awsmblx550bs017:/tmp$ ./userspace
Argument count Is: 1
Program Name Is: ./userspace

No Extra Command Line Argument Passed Other Than Program Nameaadarsh@awsmblx550bs017:/tmp$ ./userspace hello
Argument count Is: 2
Program Name Is: ./userspace

Number Of Arguments Passed: 2
----Following Are The Command Line Arguments Passed----
argv[0]: ./userspace
argv[1]: helloaadarsh@awsmblx550bs017:/tmp$ ./userspace hello jamal
Argument count Is: 3
Program Name Is: ./userspace

Number Of Arguments Passed: 3
----Following Are The Command Line Arguments Passed----
argv[0]: ./userspace
argv[1]: hello
argv[2]: jamalaadarsh@awsmblx550bs017:/tmp$ ./userspace ro.rpmb.diagnostics
Argument count Is: 2
Program Name Is: ./userspace