Access string's characters from array of pointers to strings

Question

I am new to programming and have faced this particular problem:

int *FindLine(char *lines[100],int line_number) {
  char **pointer=lines;
  int i,*stack,counter=0;
  stack=(int*)calloc(30,sizeof(int));
  for (i=0;i<line_number;i++)
    if (*pointer[i]=='{') { 
      stack[counter]=i+1;
      counter++;
    }
  return stack;
}

main(){
  char *line[100];
  FILE *fp;
  char FileName[20];
  char Buffer[100];
  fp=fopen(FileName,"r");

  while(fgets(Buffer,100,fp)!=NULL) {        
    line[i]=strdup(Buffer);                    
    i++;
  }            
  NumOfLines=i;
  Stack=FindLine(line,NumOfLines);
  system("PAUSE");
}

stack is supposed to have stored the number of the line each '{' appears in , instead it only stores it if '{' is the first char on the line. is there a way on C to access every single individual character of the strings pointed by the pointers in the array of pointers to strings ?

Use malloc instead of calloc. Did not calloc allocate memory on the stack (function scope memory)? Hence one cannot return it outside. — Joop Eggen
– Joop Eggen, Commented Apr 19, 2013 at 16:02
@JoopEggen - no. calloc does not allocate memory from the stack. It allocates it the from the heap. — user93353
– user93353, Commented Apr 19, 2013 at 16:06

user93353 · Accepted Answer · 2013-04-19 16:34:42Z

2

Change

if (*pointer[i]=='{')

to

if (!strchr(pointer[i],'{'))

You may need to add

#include <string.h>

at the beginning.

pointer[i] points to the string (array of chars). *pointer[i] gives you the first character of the string. So your if condition checks only the first character.

So you have to use strchr

strchr checks if the '{' char is there anywhere in the string. returns the pointer to first occurance if found or 0/NULL if not found.

edited Apr 19, 2013 at 16:34

answered Apr 19, 2013 at 15:44

user93353

14.1k8 gold badges64 silver badges128 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Access string's characters from array of pointers to strings

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related