avoiding duplicates

[baffleddreams]

do u noe how 2 avoid duplicates in an array while taking inputs

[Lesshardtofind]

 
while(!condition)
  enter new number

  save to array

[Adak]

For numbers with a small range, make an int array (auxiliary). Say the range was 0 to 1000:

#include <stdio.h>
#define SIZE 1000

int main() {
  int i, unique, temp; 
  int num[SIZE];
  printf("\n\n");
  for(i=0;i<SIZE;i++)
    num[i] = 0;

  i=1;
  while(i) {
    printf("\n Enter a positive integer. First repetition quits: ");
    temp = scanf("%d", &unique);
    getchar();
    if(temp && unique > -1 && unique < SIZE) {
      num[unique]++;
      if(num[unique]>1) {
        printf("\n Repetition detected - terminating loop");
        i=0;
      }
    }
  }
  i=getchar();

  printf("\n\n\t\t\t     press enter when ready");
  i = getchar();
  return 0;
}

For numbers with a large range, you'll have to either check every number in the array.

Note that the above is approximately the same as getting unique numbers by only allowing numbers from a fixed set or "draw" (which are unique), to be chosen.