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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    int answer[4];
    int y=0;
    for(int x=0;x<=3;x++){
        while(y<=3){
            answer[x]=rand()%10
            y++;
            if(x~=y && answer[x]==answer[y]){
                answer[x]=rand()%10
                y=0;
            }
        }
        y=0;
    }
 
    return 0;
}

prog.c: In function ‘main’:
prog.c:10:32: error: expected ‘;’ before ‘y’
             answer[x]=rand()%10
                                ^
                                ;
             y++;
             ~                   
prog.c:12:17: error: expected ‘)’ before ‘~’ token
             if(x~=y && answer[x]==answer[y]){
               ~ ^
                 )
prog.c:13:36: error: expected ‘;’ before ‘y’
                 answer[x]=rand()%10
                                    ^
                                    ;
                 y=0;
                 ~                   
prog.c:6:9: warning: variable ‘answer’ set but not used [-Wunused-but-set-variable]
     int answer[4];
         ^~~~~~

Standard output is empty