In this post we are going to create a program to reverse string in C++ programming language.
Reversing a number is quite easy task, see this to reverse a number
Logic to Reverse a String:
To reverse a String we just exchange the first character with last character till we reach the mid of the string.
suppose we have a string ‘PROPROGRAMMING’, let’s see the steps:
- We have 2 for loops, one from starting from 0 position and other starting from last position
- Now we swap first value with last i.e. P will be swapped with G
- Now first loop goes to position 0 + 1, and second loop goes to last – 1 position.
- Now these values are swapped i.e. R with N
- We continue to do this step till we reach the mid of the string.
- Finally we have ‘GNIMMARGORPORP’
Program to Reverse String C++:
#include<iostream> using namespace std; int main( ) { int l,i,j; char str[80]; int temp; cout<<"Enter string :"; gets(str); for(l=0;str[l]!='';l++); //finding length of string for(i=0,j=l-1;i<l/2;i++,j--) { temp=str[i]; str[i]=str[j]; str[j]=temp; } cout<<"Reverse String isn"<<str; return 0; }