www.pudn.com > c.rar > scanit.c

/* Demonstration of using scanf() */ 
 
#include  
 
#define QUIT 4 
 
int get_menu_choice( void ); 
 
int main( void ) 
{ 
    int   choice    = 0; 
    int   int_var   = 0; 
    float float_var = 0.0; 
    unsigned unsigned_var = 0; 
 
    while (choice != QUIT) 
    { 
        choice = get_menu_choice(); 
 
        if (choice == 1) 
        { 
            puts("\nEnter a signed decimal integer (i.e. -123)"); 
            scanf("%d", &int_var); 
        } 
        if (choice == 2) 
        { 
            puts("\nEnter a decimal floating-point number\ 
                  (e.g. 1.23)"); 
            scanf("%f", &float_var); 
        } 
        if (choice == 3) 
        { 
             puts("\nEnter an unsigned decimal integer \ 
                 (e.g. 123)" ); 
             scanf( "%u", &unsigned_var ); 
         } 
    } 
    printf("\nYour values are: int: %d  float: %f  unsigned: %u \n", 
                               int_var, float_var, unsigned_var ); 
 
   return 0; 
} 
 
int get_menu_choice( void ) 
{ 
    int selection = 0; 
 
    do 
    { 
        puts( "\n1 - Get a signed decimal integer" ); 
        puts( "2 - Get a decimal floating-point number" ); 
        puts( "3 - Get an unsigned decimal integer" ); 
        puts( "4 - Quit" ); 
        puts( "\nEnter a selection:" ); 
 
        scanf( "%d", &selection ); 
 
     }while ( selection < 1 || selection > 4 ); 
 
     return selection; 
}