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C++ Program to Concatenate Two Strings
A string is a one dimensional character array that is terminated by a null character. Concatenation of two strings is the joining of them to form a new string. For example.
String 1: Mangoes are String 2: tasty Concatenation of 2 strings: Mangoes are tasty
A program to concatenate two strings is given as follows.
Example
#include <iostream>
using namespace std;
int main() {
char str1[100] = "Hi...";
char str2[100] = "How are you";
int i,j;
cout<<"String 1: "<<str1<<endl;
cout<<"String 2: "<<str2<<endl;
for(i = 0; str1[i] != '\0'; ++i);
j=0;
while(str2[j] != '\0') {
str1[i] = str2[j];
i++;
j++;
}
str1[i] = '\0';
cout<<"String after concatenation: "<<str1;
return 0;
}Output
String 1: Hi... String 2: How are you String after concatenation: Hi...How are you
In the above program, there are two strings str1 and str2. A for loop is used to reach the end of str1. At the end of the for loop, i contains the index of the null value in the str1. The following code snippet demonstrates this.
for(i = 0; str1[i] != '\0'; ++i);
A while loop is used to transfer the value of str2 to str1. Variable j starts from 0 and copies the character in str2 into str1 at the position pointed by i. This loop runs till value of str2[j] is not null. This is demonstrated as follows.
j=0;
while(str2[j] != '\0') {
str1[i] = str2[j];
i++;
j++;
}After the strings are concatenated in str1, null is added to the end. Then the concatenated string is displayed. The code snippet for this is as follows −
str1[i] = '\0'; cout<<"String after concatenation: "<<str1;
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