Thread: Calling a function several times

Within one function, how does one go about making several function calls to another function, depending on a user given number?

I tried using a while loop like this:

Code:

while(shift > 0){

  rotate_right(ch);

  shift--;
}

But that only calls it once, no matter what number u enter

No I can't do that, part of the exercise is to make a function called rotate_right and one called rotate_left and yet another one called encode, i've made rotate_right and left so far...

If the number is negative, encode is supposed to call rotate_left, if the number is positive then encode should call rotate_right

It calls them fine, but it only calls them once, whereas, it needs to call them how many times the user specifies.

I think If you declare 'shift' as static, then whatever it holds will stay in memory. But it also means the memory isn't freed when the function ends, so it might not be the best possibility.

[edit]and theres allways globals[/edit]

Originally Posted by mike_g

I think If you declare 'shift' as static, then whatever it holds will stay in memory. But it also means the memory isn't freed when the function ends, so it might not be the best possibility.

[edit]and theres allways globals[/edit]

Good point, i'll try that, thanks!

Well here is the code, I can only use encode to call rotate_right, I was doing it for any amount of text, then I found I only have to do it for for 1 character that is entered. Changed the code around a bit, now it just ends after it executes the rotate_right function, I tried several ways for it to return control to the encode function, but I'm not entirely sure how to do that.

Code:

#include<stdio.h>

int ch;
int shift;

int encode(int ch, int shift);
int rotate_right(int ch);
int rotate_left(int ch);

int main (int argc, char **argv){
  
  int shift;
  int ch;
  printf("Enter shift: ");
  scanf("&#37;d", &shift);
  
  encode(ch,shift);
  
  return 0;
}

int encode(int ch, int shift){
  
  while(shift > 0){
    
   rotate_right(ch);
   shift--;
  }
  printf("%c", ch);  

  /*while(shift < 0){
    
   rotate_left(ch);
    shift++;
  }*/  
  return 0;
}    

int rotate_right(int ch){  
  
  ch = getchar();
    if((ch >= 65 && ch <= 89) || (ch >= 97 && ch <= 121)){
      ch = ch + 1;
    }
    else if(ch == 122){
      ch = ch - 25;
    }
    else if(ch == 90){
      ch = ch - 25;
    }  

  return (0);
}