strrev() In C

Purpose of strrev()

strrev() is one of the inbuilt string function in c programming which is used to reverse a given string.

How strrev() Works

The following diagram clearly illustrate the working principle of strrev() inbuilt string function in C.

In the above diagram strrev() takes one parameter which is a string . strrev() will reverse the given string.

Syntax - strrev()

• strrev() accept single parameter.
• Parameter must be a string.
• To use strrev() inbuilt string function in C, we need to declare #include<string.h> header file.

strrev(str1);

C Program - strrev()

Let us work through strrev() function. In the following program we will reverse the string using strrev() inbuilt string function.

#include <stdio.h>
#include<string.h>
int main()
{
char str1[20] = "AMBULANCE";
printf(" %s ", strrev(str1));
return 0;
}

ECNALUBMA

C Program - Without strrev()

Let us reverse the string without using inbuilt string function strrev().

#include <stdio.h>
#include<string.h>
int main()
{
char str[20] = "AMBULANCE";
char str2[20];
int i, j, k;
for(i=0; str[i]!='\0'; i++){
//finding length of a string
}
k=i-1;
for(j=0;j<i;j++)
{
str2[j]=str[k];
k--;
}
for(i=0; str[i]!='\0'; i++){
printf("%c",str2[i]);
}
return 0;
}

ECNALUBMA

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