#include <stdio.h>
int set_mode(int);
int get_info(void);
void show_info(void);
int x=0;
int main (void)
{
    int mode;
    printf("Enter 0 for metric mode,1 for US mode: ");
    scanf("%d",&mode);
    while(mode>=0)
    {
        set_mode(mode);
        get_info();
        show_info();
        printf("Enter 0 for metric mode,1 for US mode: ");
        printf("(-1 to quit): ");
        scanf("%d",&mode);
    }
    printf("Done.\n");
    return 0;
}
int set_mode(int a)
{
    if(a>1)
    {
        printf("Invalid mode specified.Mode 1(US) used.\n");
        return x=1;
    }
     if(a==1)
        return x=1;

    else
        return x=0;
}
int get_info(void)
{
    float a,b,c,d;
    if(x)
    {
        printf("Enter distance traveled in miles: ");
        scanf("%f",&c);
        printf("Enter fuel consumed in gallons: ");
        scanf("%f",&d);
        return 0;        
    }
    else
    {
        printf("Enter distance traveled in kilometers: ");
        scanf("%f",&a);
        printf("Enter fuel consumed in liters: ");
        scanf("%f",&b);
        return 1;        
    }
}
void show_info(void)
{
    if(x)
    printf("Fuel consumpt is 13.13 liters per 100 km.\n");
    else
    printf("Fuel consumpt is 25.4 miles per gallon.\n");
}


好吧 是我自己VC的问题。。。

[ 本帖最后由 esc345 于 2014-2-14 01:12 编辑 ]

好高端 完全看不懂  新手顶一个吧

如果没记错的话 float是2个字节 int 是4个字节

int 比float字节还多？？？亲

int  4个，float 4个，double 8个。