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C++ String Exercises: Check first string contains letters from the second

C++ String: Exercise-33 with Solution

Write a C++ program to verify that the letters in the second string appear in the first string. Return true otherwise false.

A string is created by using the letters of another string. Letters are case sensitive.

Test Data:
("CPP", "Cpp") -> false
("Java", "Ja") -> true
("Check first string", "sifC") ->true

Sample Solution:

C++ Code:

#include <bits/stdc++.h>
using namespace std;
bool test(std::string str1, std::string str2)
{
	int ctr = 0;
	for (int i = 0; i < str2.size(); i++)
	{
		for (int j = 0; j < str1.size(); j++)
		{
			if (str2[i] == str1[j])
			{
				ctr++;
				break;
			}
		}
	}
	return str2.size() == ctr && str1.size() >= str2.size();
}

int main()
{
	string str1 = "CPP";
	string str2 ="Cpp";
	cout << "String1: " << str1;
	cout << "\nString2: " << str2;
	cout << "\nCheck first string contains letters from the second:\n";
	cout << test(str1,str2) << endl;
	str1 = "Java";
	str2 = "Ja";
	cout << "\nString1: " << str1;
	cout << "\nString2: " << str2;
	cout << "\nCheck first string contains letters from the second:\n";
	cout << test(str1,str2) << endl;
	str1 = "Check first string";
	str2 = "sifC";
	cout << "\nString1: " << str1;
	cout << "\nString2: " << str2;
	cout << "\nCheck first string contains letters from the second:\n";
	cout << test(str1,str2) << endl;
}

Sample Output:

String1: CPP
String2: Cpp
Check first string contains letters from the second:
0

String1: Java
String2: Ja
Check first string contains letters from the second:
1

String1: Check first string
String2: sifC
Check first string contains letters from the second:
1

Flowchart:

Flowchart: Check first string contains letters from the second.

C++ Code Editor:

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Previous C++ Exercise: Reverse the words of three or more lengths in a string.

Next C++ Exercise: Remove a word from a given string.

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C++ Programming: Tips of the Day

How to replace all occurrences of a character in string?

std::string doesn't contain such function but you could use stand-alone replace function from algorithm header.

#include <algorithm>
#include <string>

void some_func() {
  std::string s = "example string";
  std::replace( s.begin(), s.end(), 'x', 'y'); // replace all 'x' to 'y'
}

Ref: https://bit.ly/3niU71x