if语句的嵌套

例3-1
#include<stdio.h>
int main()
{
	int mynumber=38;
	int yournumber;
	
	printf("input your number: ");
	scanf("%d",&yournumber);
	if(yournumber==mynumber)
	
		printf("OKn");
	else
		if(yournumber>mynumber)
		printf("biggern");
		else
		printf("smallern");
		
	return 0;	
	 } 

input your number: 67
bigger
input your number: 24
smaller

例3-2
#include<stdio.h>
int main()
{
	int number;
	printf("enter a number:" );
	scanf("%d",&number);
	if(number%2==0){
		printf("偶数n");
		
	}
	else{
		printf("奇数n");
		
	}
	return 0;
 } 
enter a number:56
偶数
enter a number:17
奇数

例3-3
#include<stdio.h>
int main()
{
	int count,i,n;
	double grade,total;
	scanf("%d",&n);
	total=0;
	count=0;
	for(i=1;i<=n;i++)
	
	{
		printf("Enter grade#%d: ",i);
		scanf("%lf",&grade);
		total=total+grade;
		if(grade<60)
		{
			count++;
			
		 } 	 
	}
	printf("average=%.2fn",total/n);
	printf("number of failure=%dn",count);
	return 0;
	
 } 
5
Enter grade#1: 34
Enter grade#2: 67
Enter grade#3: 78
Enter grade#4: 89
Enter grade#5: 96
average=72.80
number of failure=1

练习3-3
#include<stdio.h>
int main()
{

	int count,i,n;
	double grade,total;
	count=0;
	total=0;
	scanf("%d",&n);
	 
	for(i=1;i<=n;i++)
	{
		printf("enter grade#%d ",i);
		scanf("%lf",&grade);
		total=total+grade;
		if(grade>=60)
		{
			count++;
		}	
	}
	printf("average=%.2lf",total/n);
	printf("passer=%d",count);
	
	
	return 0;
}
5
enter grade#1 67
enter grade#2 78
enter grade#3 89
enter grade#4 34
enter grade#5 56
average=64.80passer=3

练习3-2
#include<stdio.h>
int main()
{
	int x; 
	scanf("%d",&x);
	
	if(x<0)
	{
		printf("y=sign(x)=%d",-1);
	 } 
	else if(x==0)
	{
		printf("y=sign(x)=%d",0);
	
	}
	else 
	printf("y=sign(x)=%d",1);
	
	return 0;
 } 

原则：else与最近的if匹配，必要的时候可以用大括号区分开

注意：

1）永远在if和 else后面加大括号

2）错误使用==和=，if后的括号里用的是==判断等式

最后

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