loop

[haidarrrr]

hi im new to c what i want is that when the user enters an invalid charartar it tells it runs again and tells to try again my code is

    a.x = "who won the FIFA world cup 1986";
 
 
 
 
    Expand|Select|Wrap|Line Numbers
 
 
 
    
 
     printf("%s choose between\nA:Brazil\nB:Italy\nC:Germany\nD:Argentina\n", a.x);
 
    alt = getchar();
  
  
 
    while (alt = getchar()){
  
 
        switch (alt){
  
 
        case 'A':
 
            printf("right\n");
 
            break;
  
 
        case 'B':
 
            printf("tyvaar\n");
 
            break;
 
        case 'C':
 
            printf("tyvaar\n");
 
            break;
 
        case 'D':
 
            printf("tyvaar\n");
 
            break;
 
        default:
  
 
            printf("tyvaar!!! choose right din turk!\n");
 
            break;
  
 
        }
  
 
        fflush(stdin);
  
 
    }
 
    printf("tyvaar!!! choose right din turk!\n");
 
    system("pause");
 
}