Mã chấm: 15413

Main.c: In function ‘main’:
Main.c:6:15: warning: unused variable ‘c’ [-Wunused-variable]
  int a, b, x, c;
               ^
Main.c:9:12: error: ‘a’ undeclared (first use in this function)
   }while ((a <=0 || a>100) && (b <=0 || b>100) && (x <=0 || x>100))
            ^
Main.c:9:12: note: each undeclared identifier is reported only once for each function it appears in
Main.c:9:32: error: ‘b’ undeclared (first use in this function)
   }while ((a <=0 || a>100) && (b <=0 || b>100) && (x <=0 || x>100))
                                ^
Main.c:9:52: error: ‘x’ undeclared (first use in this function)
   }while ((a <=0 || a>100) && (b <=0 || b>100) && (x <=0 || x>100))
                                                    ^
Main.c:10:4: error: expected ‘;’ before ‘c’
    c = (x*3)-a-b;
    ^
Main.c:11:27: error: ‘c’ undeclared (first use in this function)
    printf("Vay c la: %d", c);  
                           ^
Main.c:8:4: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d %d", &a, &b, &x);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~