How can I check if a specific char exists in a char array

Question

How can I search for a specific character in a char array ?

Follow my code, but I think it's not correct in the function strchr:

while((c = getc(fp)) != EOF) {
   for (i = 0; i < 1; i++) {
      c2[i] = c;
      int test = strchr(";", c2[i]);
   }
   printf("%c", c);
}

I have a structure that has int index, int data, and a pointer to the next register. I fill an array (c2[100]) with some data that come from my .cvs file. In the first register of my array I got something like this: 800;lucas . I need to find the character ';' in this array and split it, and then the number 800 will be the structure->index and the name 'lucas' will be the structure->data.

man 3 strchr - do this on a shell and read the man page to understand what strchr does. — hari
– hari, Commented Dec 1, 2011 at 21:26
I really don't have a clue what this code is doing. What is the character you are trying to find? Is it c2[i]? Is it intentional that your loop ends at 0? (i < 1 means your i is never > 0) — jsalonen
– jsalonen, Commented Dec 1, 2011 at 21:28
What are you trying to achieve? You do realize that your loop runs only once? — Andrejs Cainikovs
– Andrejs Cainikovs, Commented Dec 1, 2011 at 21:28

Remy Lebeau · Accepted Answer · 2011-12-01 21:33:59Z

2

For each character that is read, you are storing it into the first slot of your c2[] array (ignoring the rest of the array), and then calling strchr() to check if the read character is a ; or not. Using strchr() for that is overkill. The following would be much simplier:

while((c = getc(fp)) != EOF)
{ 
    if (c == ';')
    {
        ...
    }
    printf("%c", c); 
}

If you are actually trying to search your array instead, then you are using strchr() the wrong way. It should be more like this instead, assuming c2[] already contains the null-terminated string data you want to search in:

while((c = getc(fp)) != EOF)
{ 
    int test = strchr(c2, c); 
    ...
    printf("%c", c); 
}

answered Dec 1, 2011 at 21:33

Remy Lebeau

609k36 gold badges516 silver badges875 bronze badges

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

2 Comments

Lucas_Santos Over a year ago

I have a structure that has int index, int data, and a pointer to the next register. I fill an array (c2[100]) with some data that come from my .cvs file. In the first register of my array I got something like this: 800;lucas . I need to find the character ';' in this array and split it, and then the number 800 will be the structure->index and the name 'lucas' will be the structure->data.

Remy Lebeau Over a year ago

Then use the second example I gave you, where the first parameter of strchr() is passed your buffer that contains the "800;lucus" string. However, you mention that you want to split the buffer, in which case you can use strtok(), or better sscanf(), instead of using strchr().

Collectives™ on Stack Overflow

How can I check if a specific char exists in a char array

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related