Question

In C++, Write a function that transforms a string such that sequences of consecutive underscores become a single underscore. E.g. (‘_hello___world__’ => ‘_hello_world_’).

Related to the question: Consolidate multiple characters to one character in c++. abbbcc -> abc

Answer 1

without the libraries:

#include <stdio.h>
char *RemoveUnderScore(char *src)
{
    char* readIndex;
    char* writeIndex;
    if (src==NULL) return NULL;
    readIndex = writeIndex = src;

    while (*readIndex != '\0')
    {
        while(*readIndex !='_' && *readIndex != '\0')
            *writeIndex++ = *readIndex++;

        if (*readIndex != '\0')
            *writeIndex++ = *readIndex++;

        while (*readIndex == '_')
            readIndex++;
    }

    *writeIndex = '\0';
    return src;
}

int main(int argc,char** argv){
    char str[] = "_hello___worl__d___";
    printf(RemoveUnderScore(str));
    return 0;
}