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#include <stdio.h>
#include <stdlib.h>
int main()
{
 int x[15], y[15],i;
 randomize();
 for(i=0;i<15;i++)
 x[i] = random(20);
 for(i=0;i<15;i++)
 y[14-i] = x[i];
 printf("Array x --> ");
 for(i=0;i<15;i++)
 printf("%d ",x[i]);
 printf("\nArray y --> ");
 for(i=0;i<15;i++)
 printf("%d ",y[i]);
 return 0;
}
 

prog.c: In function ‘main’:
prog.c:6:2: warning: implicit declaration of function ‘randomize’ [-Wimplicit-function-declaration]
  randomize();
  ^~~~~~~~~
prog.c:8:9: warning: implicit declaration of function ‘random’ [-Wimplicit-function-declaration]
  x[i] = random(20);
         ^~~~~~
/home/01zhLP/ccd4Ap2f.o: In function `main':
prog.c:(.text.startup+0x1b): undefined reference to `randomize'
collect2: error: ld returned 1 exit status

Standard output is empty