第8章第3讲变量存储类别及内外部函数

#include"stdio.h"
void f(int a,int b)
{
    int i,j;
    i=a+2;
    j=b-1;
    printf("函数f中:a=%d,b=%d\n",a,b);
    printf("函数f中:i=%d,j=%d\n",i,j);
}
main()
{
    int i=4,j=5;
    f(i,j);
    printf("主函数中:i=%d,j=%d\n",i,j);
} 

#include"stdio.h"
float s;
float ls(float r)
{
    float len;
    len=2*3.14*r;
    s=3.14*r*r;
    return len;
}
main()
{
    float c,r;
    printf("请输入圆的半径:");
    scanf("%f",&r);
    c=ls(r);
    printf("圆的周长为:%f\n",c);
    printf("圆的面积为:%f\n",s);
} 

#include"stdio.h"
f(int a) 
{
    auto b=2; 
    static c=3; 
    b=b+1; 
    c=c+1; 
    return a+b+c; 
} 
main() 
{
    int a=1,i; 
    for(i=1;i<=2;i++) 
      printf("第%d次调用后结果：%d\n",i,f(a)); 
} 

#include"stdio.h"
void save() 
{
    int money; 
    extern amount;
    printf("请输入存款金额:");
    scanf("%d",&money);
    amount=amount+money;
} 
int amount=10000; 
main() 
{ 
     save();
     printf("余额为:%d元\n",amount); 
}