Using scanf() to read choice for menu and decimal value and float number - C Language Basics

C examples for Language Basics:scanf

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Description

Using scanf() to read choice for menu and decimal value and float number

Demo Code

#include <stdio.h>

#define QUIT 4/*w w w  .ja  v  a  2 s  .c o m*/

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;
}

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;
}

Result


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