Range check 範圍檢查: int age; int score; int month; 1-12

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Presentation transcript:

Range check 範圍檢查: int age; 1-100 int score; 0-100 int month; 1-12 char sex; 'M' or 'F' char house; 'L','M','C','S' char ans; 'y' or 'n' /* 1a */ do{ printf ("Q: age(1-100)? "); scanf if(…) printf ("Error\n"); }while ( );

/* 1b */ do{ printf ("Q: age(1-100)? "); scanf ("%d", &age); }while ( ! ); if ( ) printf("Error\n"); /* 1c */ while ( ){ printf ("Q: age(1-100)? "); scanf ("%d", &age); if ( ! ) printf("Error\n"); }

/* 2a */ do{ printf ("Q: are you hungry<y/n>? "); scanf ("%c", &ans); ans = (ans); }while ( ); /* 2b */ do{ printf ("Q: are you hungry<y/n>? "); scanf ("%c", &ans); if (!(ans ans )) printf ("Error\n"); }while ( ! );

if (!(mm>=1 && mm<=12 && dd>=1 && dd<= )) switch ( ) { case 2: case 4: case 6: case 9: case 11: default: } /* 3a */ do{ printf ("Q: month (1-12)? "); scanf ("%d", &mm); printf ("Q: day (1-31)? "); scanf ("%d", &dd); if(mm== ) max = 28; else if( ) max = 30; else max = ___ if (!(mm>=1 && mm<=12 && dd>=1 && dd<= )) printf ("Error - out of range!\n"); }while (mm || mm || dd || dd );