Why do my code gives different result at times

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I'm trying to figure out why does my code gives me different results are runtime

for instance on first test it works
second test a totally different result
third test no result at all

below is my code :

char *Amy[] = {"Olivia \n Emma \n Ava\n Mia\n Charloth\n Noah \n Liam \n Ben \n Oliver \n will"};

printf("\n Amy's Profile\n");

printf("Student Names :\n %s",*Amy,"\n");

What I have tried:

I haven't try much at all since I don't quite see my mistake

Posted 22-Mar-19 16:37pm

sean871

Updated 22-Mar-19 23:14pm

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OriginalGriff · Accepted Answer · 2019-03-22T21:01:00

You're going to have to be more exact about the code you use when the problem occurs: If I paste your code into an online compiler and try it:

C++

#include <stdio.h>

int main()
    {
    printf("Hello World\n");
    char *Amy[] = {"Olivia \n Emma \n Ava\n Mia\n Charloth\n Noah \n Liam \n Ben \n Oliver \n will"};
    printf("\n Amy's Profile\n");
    printf("Student Names :\n %s",*Amy,"\n");
    return 0;
    }

It does the same thing each time I run it:

Hello World                                                                                                                                                    
                                                                                                                                                               
 Amy's Profile                                                                                                                                                 
Student Names :                                                                                                                                                
 Olivia                                                                                                                                                        
 Emma                                                                                                                                                          
 Ava                                                                                                                                                           
 Mia                                                                                                                                                           
 Charloth                                                                                                                                                      
 Noah                                                                                                                                                          
 Liam                                                                                                                                                          
 Ben                                                                                                                                                           
 Oliver                                                                                                                                                        
 will

Which is what I expect.
I would suggest one improvement to your code though:

C++

printf("Student Names :\n %s", Amy[0], "\n");

Is normally a better way of accessing an array than using a pointer. It won't make any difference to your code output though.

CPallini · Accepted Answer · 2019-03-22T23:15:00

Quote:
char *Amy[] = {"Olivia \n Emma \n Ava\n Mia\n Charloth\n Noah \n Liam \n Ben \n Oliver \n will"};

The above line defines an array of pointers (to characters) having just one item.
While not technically a mistake, it is probably not what you intended.

Quote:
printf("Student Names :\n %s",*Amy,"\n");

The above line is incorrect (see the printf documentation[^]): your format string specifies just one argument (%s), but you are providing two (amy[0] and "\n"). A decent compiler would produce a warning.

I would have written it this way:

C

#include <stdio.h>

int main()
{
  const char *Amy = "Olivia \n Emma \n Ava\n Mia\n Charloth\n Noah \n Liam \n Ben \n Oliver \n will";
  printf("\n Amy's Profile\n");
  printf("Student Names :\n %s\n", Amy);
  return 0;
}

Why do my code gives different result at times

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