Write a program in c plus plus to reverse the sentence?

Answer 1

The simplest solution is to use a template function that will reverse an array of any type. This is achieved by iteratively working from both ends of the array, swapping characters while the left index is less than the right. The following example demonstrates the function using both a character array and a std::string, but the function will also work with an array of any type.

#include<iostream>

#include<string>

template<class T>

void rev_array(T A[], size_t size )

{

size_t left=0, right=size-1;

while( left<right )

{

T tmp=A[left];

A[left]=A[right];

A[right]=tmp;

++left; --right;

}

}

int main()

{

char arr[] = "Hello world!";

std::cout<<arr<<std::endl;

rev_array(arr, strlen(arr));

std::cout<<arr<<std::endl;

std::cout<<std::endl;

std::string str = "The cat sat on the mat.";

std::cout<<str.c_str()<<std::endl;

rev_array(&str[0], str.size() );

std::cout<<str.c_str()<<std::endl;

std::cout<<std::endl;

return(0);

}

Example output:

Hello world!

!dlrow olleH

The cat sat on the mat.

.tam eht no tas tac ehT

Answer 2

#include<stdio.h>

#include<string.h>

int main()

{

char word[100],rev_word[100];

int l,i, j=0, v=0;

printf("Please enter a word: ");

gets(word);

l = strlen(word);

for(i=l-1; i>=0; i--){

rev_word[j]=word[i];

j++;

}

rev_word[j] = '\0';

printf("word = %s\n", word);

printf("reverse word = %s\n", rev_word);

system("pause");

return 0;

}