c,string,char , Remove specified char from strings in C


Remove specified char from strings in C

Question:

Tag: c,string,char

I am making a program that will search in an array of strings, and for each string, it will search for a specified char. If it finds that char, remove it. In this example I want to remove the character 'r'.

Here is the code:

void convertStrings(char **line) {
    for (int str = 0; str < MAX_LINE_LENGTH; ++str) {
        for (int ch = 0; ch < MAX_STR_LENGTH; ++ch) {
            if (line[str][ch] == 'r') {
                removeChar(line[str], 'r');
            }
        }
    }
}

void removeChar(char *str, char c) {
    int i = 0;
    int j = 0;

    while (str[i]) {
        if (str[i] != c) {
            str[j++] = str[i];
        }
        i++;
    }
    str[j]=0;
}

I am not sure if the algorithm for the removal of chars is correct, however the main mistake is elsewhere. More specifically, I get a segmentation fault in the line:

if (line[str][ch] == 'r') {

Why am I getting a seg fault? Also, is the algorithm for removeChar correct?

Here is my main function:

int main() {
    char line[3][10] = {"pep", "rol", "rak"};
    printf("%s\n", line[1]);
    convertStrings(line);
    printf("%s\n", line[1]);
    return 0;
}

Thanks in advance.


Answer:

This code works on my compiler :

#include<stdio.h>
#include<conio.h>
#define MAX_LINE_LENGTH 1024
#define MAX_STR_LENGTH 4
void removeChar(char *str, char c) {
int i = 0;
int j = 0;

while (str[i]) {
    if (str[i] != c) {
        str[j++] = str[i];
      }
    i++;
}
str[j]=0;
}

void convertStrings(char line[][MAX_STR_LENGTH]) {    //change 1
 for (int str = 0; str < MAX_LINE_LENGTH; ++str) {
    for (int ch = 0; ch < MAX_STR_LENGTH; ++ch) {
        if (line[str][ch] == 'r') {
removeChar(line[str], 'r');
        }
    }
  }
}


int main() {
 char line[3][MAX_STR_LENGTH] = {"pep", "rol", "rak"};   //change 2
 printf("%s\n", line[1]);
 convertStrings(line);
 printf("%s\n", line[1]);
 getch();
 return 0;
}

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