u3.txt

CProgramming C学习的好书

1--------------------------------
#include <stdio.h>
	void main()
{
	int blank,digit,i,other,letter;
	char ch;
	blank=letter=digit=other=0;
	printf("input 15 characters:\n");
	for(i=1;i<=15;i++){
		ch=getchar();
		if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
			letter++;
		else if(ch>='0'&&ch<='9')
			digit++;
		else if(ch=='\n')
			blank++;
		else
			other++;
		}
	printf("enter=%d,digit=%d,other=%d,letter=%d",blank,digit,other,letter);
}
2--------------------------------
#include <stdio.h>
	void main()
{
	int choice,i;
	float price;
	for(i=1;i<=5;i++){
		printf("[1]apples\n[2]pears\n[3]oranges\n[4]grapes\n[0]Exit\nEnter choice\n");
		scanf("%d",&choice);
		
		if(choice==0)
			break;
		switch (choice){
		case 1:price=3.00;break;
		case 2:price=2.50;break;
		case 3:price=4.10;break;
		case 4:price=10.20;break;
		default:price=0;
		}
	printf("price=%.1f\n",price);
	}
	printf("Thanks\n");
}
		
		
}
3--------------------------------
#include <stdio.h>
	void main()
{
	int mark;
	printf("input the mark:\n");
	scanf("%d",&mark);
	
	if(mark<60)
		printf("Fail");
	else printf("Pass");
}
4--------------------------------
#include <stdio.h>
#include <math.h>
	void main()
{
	float a,b,c,s;
		
	printf("input a,b,c:\n");
	scanf("%f%f%f",&a,&b,&c);
	s=(a+b+c)/2;
	
	if(a+b>c&&a+c>b&&b+c>a)
		printf ("area=%.2fperimeter=%5.2f",sqrt(s*(s-a)*(s-b)*(s-c)),2*s);
	else printf("These sides do not correspond to availd triangle.\n");
}
5--------------------------------
#include <stdio.h>
	void main()
{
	int a,b,c,d,max;
	
	printf("input a,b,c,d:\n");
	scanf("%d%d%d%d",&a,&b,&c,&d);
	
	max=a;
	if(max<b)
		max=b;
	if(max<c)
		max=c;
	if(max=d)
		max=d;
	printf("max=%d",max);
}
6--------------------------------
#include <stdio.h>
	void main()
{
	float salary,rate,tax;
	
	printf("input salary");
	scanf("%f",&salary);
	
	if(salary>5850)
		rate=20;
	else if(salary>2850)
		rate=15;
	else if(salary>1350)
		rate=10;
	else if(salary>850)
		rate=5;
	else rate=0
		
	tax=rate*(salary-850)/100;
	printf("tax=%f",tax);
}