C语言程序入门——if-else及switch分支结构与for、do-while循环1.1.2

#include<stdio.h>#include<stdlib.h>intmain()
{
inti;
printf("Enter a number:");
scanf("%d",&i);
if(i%2!=0){
printf("The number is odd");
    }else{
printf("The number is even");
    }
system("pause");
return0;
}

#include<stdio.h>#include<stdlib.h>intmain()
{
inta,b,c;
scanf("%d %d %d",&a, &b, &c);
intmax=0;
if(a>b){
if (a>c)
    {
max=a;
    }else{
max=c;
    }
    }elseif (b>c){
max=b;
    }else{
max=c;
    }
printf("最大值max=%d\n",max);
system("pause");
return0;
}

#include<stdio.h>#include<stdlib.h>intmain()
{
intn;
scanf("%d",&n);
intfact=1;
inti=1;
for( i=1; i<=n;i++){
fact*=i;                //循环体语句：被反复执行的语句，只能是一条！！！    }
printf("%d! = %d\n", n, fact);
system("pause");
return0;
}

#include<stdio.h>#include<stdlib.h>intmain()
{
intx;
intn=0;
scanf("%d",&x);
n++;
x/=10;
while (x>0){
n++;
x/=10;
printf("x = %d,n = %d\n",x, n);
    }
printf("n = %d\n",n);
system("pause");
return0;
}

#include<stdio.h>#include<stdlib.h>intmain()
{
intx;
intn=0;
scanf("%d",&x);
do{
x/=10;
n++;
    }
while (x>0);
printf("n = %d\n",n);
system("pause");
return0;
}

#include<stdio.h>#include<stdlib.h>#include<time.h>intmain()
{
srand(time(0));
intnumber=rand()%100+1;
intcount=0;
inta=0;
printf("我已经想好了一个1到100的数");
do{
printf("请输入一个数");
scanf("%d",&a);
count++;
if(a>number){
printf("你猜的数大了");
        }elseif(a<number){
printf("你猜的数小了");
        }
    }while(a!=number);
printf("恭喜你猜对了，共猜了%d次\n",count);
system("pause");
return0;
}