Thread: retreiving variable from within loop.

There is probably a fairly simple explenation to this, but how do you a variable to maintain a value it gained in a for loop, specifically a character array? I alter the "value" of the array in the loop and I want that value to carry on thorugh out the rest of the program program. Any help is appreciated.

This might be a question of scope? Just declare the value outside the loop?

ok, yeah i should have inclluded an example:

Code:

char a[1000];
int x = o;
for(x = 0; X<100; x++){
     a = do some stuff/calculations;
}
printf("%s\n", a);
//and then do other stuff with a
//a contains no data outside of the loop, why?

when I do something like this, a contains no data as if it were never inisialized.

If you are only assigning the value once then there should be no problem. If you want to assign multiple values and reference them at a later time then you need to use a character array of pointers and say the values to that.

Alright, how to explain this. I declaire the arrays value outside of the loop and then alter that value inside the loop. What I get inside the loop is the value I want to continue throughout the rest of the program. I think I found a work around but further knowledge would be helpful.

//a contains no data outside of the loop, why?

Does a contain any data inside the loop?

I cant get your code to compile, it says there is an unnessisary @.

>>Does a contain any data inside the loop?
Yes. Prior to the loop I assign input to the array. I then alter that input in the array. If I print out the array in the loop it works and prints out the info. If I try to print outside the loop (after it is terminated, it outputs nothing.

Yes. Prior to the loop I assign input to the array. I then alter that input in the array. If I print out the array in the loop it works and prints out the info. If I try to print outside the loop (after it is terminated, it outputs nothing.

Then may-be you could post some code. The pseudocode you posted doesn't show that.

here:

Code:

#include <stdio.h>
#include <stdlib.h>

void encrypt();

int main(int argc, char *argv[])
{
  encrypt();
  getchar();
  return 0;
}

void encrypt()
{
     //
     //declaring variables and file initilization
     //
     FILE *fp;
     char file[150000];
     char encrypt[150000];
     char decrypt[150000];
     int count = 0;
     int a = 0;
     int x = 0;
     char key[16] = "aeiluozcgraolifi";
     //
     //file is opened here and checked for errors
     //
     fp = fopen("c:\\test.txt", "r");
     if(fp == NULL)
     {
           puts("No such file or directory.");
     }
     else{
          fread(file, 1000, 150, fp);
     }
      //
      //checks for total number of characters in document
      //
      for(a = 0; file[a] != '\0'; a++)
      {
        ++count;
      }
      
      for(x = 0; x < count; x++){
            encrypt[x] = file[x] ^ key[x];
            }
            printf("%s", encrypt);  
     
}