In this article we will learn to implement a C program to reverse the given string using a pointer. A C program is provided below for reversing a given string using a pointer.
Program is as follows:
/*
* C program to reverse a given string using pointers
* Author: P.S.SuryaTeja
*/
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
void reverse(char *str)
{
char *first, *last, temp;;
int i, stringlength;
first = str;
stringlength = strlen(str);
for(i = 0; i < stringlength - 1; i++)
str++;
last = str;
str = first;
while(first < last)
{
temp = *first;
*first = *last;
*last = temp;
first++;
last--;
}
puts(str);
}
int main(int argc, char **argv)
{
char str[20];
printf("Enter a string: ");
gets(str);
printf("Reverse of the string is: ");
reverse(str);
getch();
return 0;
}
Input and output for the above program is as follows:
Enter a string: howdy
Reverse of the string is: ydwoh
Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.
He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.
He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.
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