- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ program to swap two strings
In this article, you will learn and get code to swap two strings entered by the user using a C++ program. Here is the list of programs that can swap two given strings:
In C++, use the library function to swap two strings
To swap two strings in C++ programming, you have to ask the user to enter the two strings. The value of both strings gets stored in two variables, say, strOne (the first string) and strTwo (the second string). Now swap these two strings using a third variable, say strTmp, with the help of the library function strcpy(), as shown in the program given below:
#include<iostream> #include<stdio.h> #include<string.h> using namespace std; int main() { char strOne[50], strTwo[50], strTmp[50]; cout<<"Enter the First String: "; gets(strOne); cout<<"Enter the Second String: "; gets(strTwo); cout<<"\nString before Swap:\n"; cout<<"First String = "<<strOne<<"\tSecond String = "<<strTwo; strcpy(strTmp, strOne); strcpy(strOne, strTwo); strcpy(strTwo, strTmp); cout<<"\n\nString after Swap:\n"; cout<<"First String = "<<strOne<<"\tSecond String = "<<strTwo; cout<<endl; return 0; }
This program was built and runs under the Code::Blocks IDE. Here is its sample run:
Now supply two strings, say codes as the first and cracker as the second string. Here is the sample run with these two strings as input:
The following block of code:
strcpy(strTmp, strOne); strcpy(strOne, strTwo); strcpy(strTwo, strTmp);
is responsible for swapping two strings. For example, if the user enters the same two strings as given in the above program's sample run. Initially, strOne=codes and strTwo=cracker. Now, after executing the first statement (of the three lines of code listed above):
strcpy(strTmp, strOne);
The value of strOne gets copied to strTmp. So strTmp=codes. In a similar way, after executing the following (second) statement:
strcpy(strOne, strTwo);
The value of strTwo gets copied to strOne. So strOne=cracker. And using the third statement, that is:
strcpy(strTwo, strTmp);
The value of strTmp gets copied to strTwo. So strTwo=codes. In this way, swapping gets performed using the strcpy() library function in C++.
Swap two strings without using a library function in C++
This program just copies the string manually (using user-based code) without using the library function strcpy():
#include<iostream> #include<stdio.h> using namespace std; int main() { char strOne[50], strTwo[50], strTmp[50]; int i=0; cout<<"Enter the First String: "; gets(strOne); cout<<"Enter the Second String: "; gets(strTwo); cout<<"\nString before Swap:\n"; cout<<"First String = "<<strOne<<"\tSecond String = "<<strTwo; while(strOne[i]!='\0') { strTmp[i] = strOne[i]; i++; } strTmp[i] = '\0'; i=0; while(strTwo[i]!='\0') { strOne[i] = strTwo[i]; i++; } strOne[i] = '\0'; i=0; while(strTmp[i]!='\0') { strTwo[i] = strTmp[i]; i++; } strTwo[i] = '\0'; cout<<"\n\nString after Swap:\n"; cout<<"First String = "<<strOne<<"\tSecond String = "<<strTwo; cout<<endl; return 0; }
This program produces the same output as the previous program. In the above program, instead of using the strcpy() function to copy strings, we've done the same thing using user-based code.
Note: To learn more about copying one string to another, refer to the copy string program to get all the required information about the topic. There you will get full details about how the code given in the previous program works.
The same program in different languages
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