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OrbWorks Community Forum • View topic - Random numbers
Page 1 of 1

PostPosted: Sat Feb 22, 2003 12:14 am
by reguser
Hi,Something is wrong in the code.
I can't get the numbers to be 20 different numbers!
What is wrong?,Anyone.

//randomnumbers.c
// Global variables
int check[20],dd[20];
int x;

main(){
//local variables
int a,b,cc,i,j;
clear();
for(a=1;a<=20;a++){
check[a]=0;
}//end a

for (b=1;b<=20;b++){
do{
cc=random(20)+1;
break;
}while(check[cc]==0)

if(check[cc]==0);
dd[b]=cc;
check[cc]=1;

}//end b
//Sorting the first 10 numbers
for(j=1;j<=10;j++){
for(i=1;i<=10;i++){
if(dd[j] < dd[i]){
x=dd[j];
dd[j]=dd[i];
dd[i]=x;
}//if
}//i
}//j

//Show the first 10 numbers in order
for(a=1;a<=10;a++){
puts(dd[a]+" ");
}//end a

puts("\n");
puts("\n");
//Sorting the last 10 numbers
for(j=11;j<=20;j++){
for(i=11;i<=20;i++){
if(dd[j] < dd[i]){
x=dd[j];
dd[j]=dd[i];
dd[i]=x;
}//if
}//i
}//j
//Show the last 10 numbers
for(a=11;a<=20;a++){
puts(dd[a]+" ");
}//end a
wait();
}// end main

regards

Robert Blennerhed

PostPosted: Sat Feb 22, 2003 10:31 am
by soinsg
Arrays start at 0 and end at given number of elements - 1.
Code: Select all
int check[20];
int a;
for(a=0; a<=19; a++) {
  check[a]=0;
  }//end a
}

Also variables start off at 0 so that for() wasn't really needed.
If you are compiling on board I think you may find that:
int a=0,b=0,cc=0,i=0,j=0;

produces less bytecode than:
int a,b,cc,i,j;