How to create a string of variable length with character X in C

cinitializationloopsstring

I am new to C and am having some troubles with strings. How do I create a string of variable length containing a specified character in C? This is what I have tried but I get a compiler error:

int  cLen     = 8    /* Specified Length    */ 
char chr      = 'a'; /* Specified Character */
char outStr[cLen];
int  tmp      = 0;
while (tmp < cLen-1)
  outStr[tmp++] = chr;

outStr[cLen-1] = '\0';

/* outStr = "aaaaaaaa" */

Best Answer

You can try:

char *str = malloc(cLen + 1);
memset(str, 'a', cLen);
str[cLen] = 0;

Related Solutions

Bash – How to check if a string contains a substring in Bash

You can use Marcus's answer (* wildcards) outside a case statement, too, if you use double brackets:

string='My long string'
if [[ $string == *"My long"* ]]; then
  echo "It's there!"
fi

Note that spaces in the needle string need to be placed between double quotes, and the * wildcards should be outside. Also note that a simple comparison operator is used (i.e. ==), not the regex operator =~.

C++ – How to iterate over the words of a string

I use this to split string by a delimiter. The first puts the results in a pre-constructed vector, the second returns a new vector.

#include <string>
#include <sstream>
#include <vector>
#include <iterator>

template <typename Out>
void split(const std::string &s, char delim, Out result) {
    std::istringstream iss(s);
    std::string item;
    while (std::getline(iss, item, delim)) {
        *result++ = item;
    }
}

std::vector<std::string> split(const std::string &s, char delim) {
    std::vector<std::string> elems;
    split(s, delim, std::back_inserter(elems));
    return elems;
}

Note that this solution does not skip empty tokens, so the following will find 4 items, one of which is empty:

std::vector<std::string> x = split("one:two::three", ':');

Best Answer

Related Solutions

Bash – How to check if a string contains a substring in Bash

C++ – How to iterate over the words of a string

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