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C Exercises: Get reverse of a string

C Recursion: Exercise-9 with Solution

Write a program in C to reverse a string using recursion.

Pictorial Presentation:

C Exercises: Get reverse of a string

Sample Solution:

C Code:

#include<stdio.h>
#define MAX 100
char* ReverseOfString(char[]);

int main()
{

    char str1[MAX],*revstr;
	printf("\n\n Recursion : Get reverse of a string :\n");
	printf("------------------------------------------\n");	

    printf(" Input any string: ");
    scanf("%s",str1);

    revstr = ReverseOfString(str1);//call the function ReverseOfString

    printf(" The reversed string is: %s\n\n",revstr);
    return 0;
}
char* ReverseOfString(char str1[])
{
    static int i=0;
    static char revstr[MAX];
    if(*str1)
    {
         ReverseOfString(str1+1);//calling the function ReverseOfString itself
         revstr[i++] = *str1;
    }
    return revstr;
}

Sample Output:

 Recursion : Get reverse of a string :                                                                        
------------------------------------------                                                                    
 Input any string: w3resource                                                                                 
 The reversed string is: ecruoser3w   

Flowchart:

Flowchart: Get reverse of a string.

C Programming Code Editor:

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Previous: Write a program in C to get the largest element of an array using recursion.
Next: Write a program in C to find the Factorial of a number using recursion.



C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP




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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP