how can i fix this?

Question

Hey guys
why this code doesn't work.
input ==> HEllo WRold
output should be = heLLO wrOLD
#include <stdio.h>
#include <string.h>
void ToggleStr(char Str[100] , int aa);
int main()
{
char StrReza[100];
int a = strlen(StrReza);
fgets(StrReza,100,stdin);
ToggleStr(StrReza , a);
return 0;

}
void ToggleStr(char Str[100] , int aa)
{
for(int i=0;i<aa;i++)
{
if(Str[i]>=65 && Str[i]<=90)
{
Str[i]=Str[i]+32;
}
else if(Str[i]>=90 && Str[i]<=122)
{
Str[i]=Str[i]-32;
}
else
{
continue;
}
}
printf("%s",Str);
}

Answer 1

The problem is that in the main() function, 'a' is always 0, no matter what the input is. This is because 'StrReza' is empty when you call strlen() on line 6. So it always returns 0, and hence 'a' is always assigned 0.

The fix is to move the line where you're assigning length of 'StrReza' after the line where you're taking input. So line 6 & 7 would be
```
fgets(StrReza, 100, stdin);
int a = strlen(StrReza);
```

That way you will be calculating length of string after taking the input.

Answer 2

@XXX
Thanks a lot
it's working now