C program to reverse a string; Through this tutorial, we will learn how to reverse a string in a c program using for loop, function, and pointer.
Programs and Algorithm to Reverse a String in C
- C program to Reverse a String using For Loop
- C program to Reverse a String using Function
- C program to Reverse a String using Pointer
Algorithm to Reverse a String
Use the following algorithm to write a program to reverse a string; as follows:
- Start
- Declare all the variables ( integer and character type )
- Enter the string to be reversed
- Find out the length of string
- Swap the position of array element using loop
- Store the swapped position
- Print the reversed string as console output
- Stop
C program to Reverse a String using For Loop
#include <stdio.h>
#include <string.h>
int main()
{
char Str[100], RevStr[100];
int i, j, len;
printf("\n Please Enter any String : ");
gets(Str);
j = 0;
len = strlen(Str);
for (i = len - 1; i >= 0; i--)
{
RevStr[j++] = Str[i];
}
RevStr[i] = '\0';
printf("\n String after Reversing = %s", RevStr);
return 0;
}
The output of the above c program; as follows:
Please Enter any String : hello String after Reversing = olleh
C program to Reverse a String using Function
#include <stdio.h>
#include <string.h>
void reverse_String(char [], int, int);
int main()
{
char Str[100], temp;
int i, j, len;
printf("\n Please Enter string : ");
gets(Str);
len = strlen(Str);
reverse_String(Str, 0, len -1);
printf("\n After Reversing = %s", Str);
return 0;
}
void reverse_String(char Str[], int i, int len)
{
char temp;
temp = Str[i];
Str[i] = Str[len - i];
Str[len - i] = temp;
if (i == len/2)
{
return;
}
reverse_String(Str, i + 1, len);
}
The output of the above c program; as follows:
Please Enter string : function After Reversing = noitcnuf
C program to Reverse a String using Pointer
#include <stdio.h>
#include <string.h>
char* reverse_String(char *Str)
{
static int i = 0;
static char RevStr[10];
if(*Str)
{
reverse_String(Str + 1);
RevStr[i++] = *Str;
}
return RevStr;
}
int main()
{
char Str[100], temp;
int i, j, len;
printf("\n Please Enter String : ");
gets(Str);
printf("\n Result = %s", reverse_String(Str));
return 0;
}
The output of the above c program; as follows:
Please Enter String : wow Result = wow
