Question

why cant i use strrev if i can't what other way is there to reverse a function

Answer 1

/*
reversing a string without using built in fn
*/
#include <stdio.h>

int main()
{
    char a[10],b[10];
    int i,j;
    printf("enter a string");
    gets(a);
    for(i=0;a[i]!='\0';i++)
    {
    }
    i--;
    for(j=0;i>=0;i--,j++)
    {
        b[j]=a[i];
    }
    b[j]='\0';
    puts(b);
    return 0;
}

Comments

please can you try using strrev function as when i am using it shows error every time while my code is correct also

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Same here.
DID you find solution?

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strrev was only available in Microsoft toolchain and does not exist in gcc of clang.  If you are using C++ you can reverse string with std::reverse.  If you are using C you need to write your own.