Program To Reverse String
String reversing is an essential concept in string related programming. There are various approaches that use different logic to reverse a string. In this chapter, you will know how to implement two different concepts and logic of reversing a string manually without using any specific predefined function.
Reversing a string means the string that will be given by the user to your program in a specific sequence will get entirely reversed when the reverse of a string algorithm gets implemented in that particular input string. In the below-mentioned example, two approaches have been used to reverse a string in C language.
Reverse the Given String by Printing It Backward
Using Swapping Concept
Using For Loop
str = Hello
j = 0
len = strlen(Str) = 5.
The strlen is a string function used to find the string length. Let us the programming flow of reverse a string
For Loop First Iteration: for (i = len – 1; i >= 0; i–)
=> for (i = 5 – 1; 4 >= 0; 4–)
The condition (4 >= 0) is True.
RevStr[j++] = Str[i]
RevStr = Str = 0
Second Iteration: for (i = 4 – 1; 3 >= 0; 3–)
The condition (3 >= 0) is True.
RevStr = Str = l
Third Iteration: for (i = 3 – 1; 2 >= 0; 2–)
The condition (2 >= 0) is True.
RevStr = Str = l
Fourth Iteration: for (i = 2 – 1; 1 >= 0; 1–)
The condition (1 >= 0) is True.
RevStr = Str = e
Fifth Iteration: for (i = 1 – 1; 0 >= 0; 0–)
The condition (0 >= 0) is True.
RevStr = Str = H
Next, the condition inside the For Loop will fail
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