Tutorial-1/exec.c at main · Swolechu/Tutorial-1 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main(int argc, char *argv[])
{
char * myarg;
char ** newarray = malloc(sizeof(char *) * argc);
printf("hello world \n");
printf("number of args=%d \n",argc);
int j=argc-1;
for (int i=0;i<argc;i++)
{
printf("arg %d=%s\n",i,argv[i]);
char * s = malloc(sizeof(char) * strlen(argv[i]));
strcpy(s,argv[i]);
newarray[j] = s;
j--;
}
myarg=argv[0];
printf("addr of myarg=%lu val of myarg=%s\n",myarg,myarg);
printf("The NULL char that terminates my string=%d\n", *(myarg+6));
printf("myarg char 0=%d %c\n",*(myarg+0),*(myarg+0));
printf("myarg char 1=%d %c\n",*(myarg+1),*(myarg+1));
printf("myarg char 2=%d %c\n",*(myarg+2),*(myarg+2));
printf("myarg char 3=%d %c\n",*(myarg+3),*(myarg+3));
printf("myarg char 4=%d %c\n",*(myarg+4),*(myarg+4));
printf("myarg char 5=%d %c\n",*(myarg+5),*(myarg+5));
printf("myarg char 6=%d %c\n",*(myarg+6),*(myarg+6));
for (int i=0;i<argc;i++) printf("newarray arg %d=%s\n",i,newarray[i]);
*(newarray[0]+1)='b';
for (int i=0;i<argc;i++) printf("newarray[%d]=%s -- argv[%d]=%s\n",i,newarray[i],i,argv[i]);
return 0;
}