String manipulation functions are really important and we often find ourselves needing them while coding in C++. High-level languages like C# and Java etc. provide such functions through methods of a string class. However, they are not inherently present in C++.
Here are some of the more frequently used string related functions. They are pretty self-explanatory. All of them are independent functions. Hope you find them useful.
Note: Don't forget to include the appropriate headers: <string> <vector> <sstream>
Here are some of the more frequently used string related functions. They are pretty self-explanatory. All of them are independent functions. Hope you find them useful.
Note: Don't forget to include the appropriate headers: <string> <vector> <sstream>
using namespace std;
string strToLowerCase(string str) {
const int length = str.length();
for(int i=0; i < length; ++i) {
str[i] = tolower(str[i]);
}
return str;
}
string strToUpperCase(string str) {
const int length = str.length();
for(int i=0; i < length; ++i) {
str[i] = toupper(str[i]);
}
return str;
}
void strReplace(string &str, const string what, const string to) {
if (str.empty() || what.empty()) return;
size_t pos;
while ( (pos = str.find(what)) != string::npos ) {
str.replace(pos, what.length(), to);
}
}
vector<string> strSplit(string s, char delim) {
vector<string> elems;
stringstream ss(s);
string item;
while(getline(ss, item, delim)) {
elems.push_back(item);
}
return elems;
}
string strTrim(string str) {
size_t pos1 = str.find_first_not_of(" \t");
size_t pos2 = str.find_last_not_of(" \t");
str = str.substr(pos1 == string::npos ? 0 : pos1,
pos2 == string::npos ? 0 : pos2 - pos1 + 1);
return str;
}
bool strStartsWith(string str, string start) {
if (start.length() > str.length()) return false;
if ( str.substr(0, start.length()) == start ) return true;
else return false;
}
bool strEndsWith(string str, string end) {
if (end.length() > str.length()) return false;
if ( str.substr(str.length() - end.length()) == end ) return true;
else return false;
}
int strCountWords(string str) {
int count = 0;
for (int i=0; i < str.length(); i++) {
if (isspace(str.at(i))) count++;
}
return (count+1);
}
