赵麒钧实验2

 

 使下一次输入的字符长度为4

#include <stdio.h>
int main()
{
int num;
scanf("%d", &num);
printf("2049%04d\n", num);
scanf("%d", &num);
printf("2049%04d\n", num);
scanf("%d", &num);
printf("2049%04d\n", num);
return 0;
}

 

 

#include <stdio.h>
int main()
{
int num,a;
while (a=1){
scanf("%d", &num);
printf("2049%04d\n", num);
}
return 0;
}

 

 

 

 

 

 

#include <stdio.h>
int main()
{
char ans1, ans2;
printf("复习了没? (输入y或Y表示复习了，输入n或N表示没复习) : ");
ans1 = getchar(); 
getchar(); 
printf("\n动手敲代码了没? (输入y或Y表示敲了，输入n或N表示木有敲) : ");
ans2 = getchar();
if ((ans1=='y'||ans1=='Y')&&(ans2=='y'||ans2=='Y')) 
printf("\n罗马不是一天建成的:)\n");
else
printf("\n罗马不是一天毁灭的。。。\n");
return 0;
}

 

 

 

 

 

 

#include <stdio.h>
int main()
{
char x;
x = getchar();
if ( x>='0'&&x<='9') 
printf("%c是数字字符\n", x);
else if ( (x>='a'&&x<='z')||(x>='A'&&x<='Z')) 
printf("%c是英文字母\n", x);
else
printf("%c是其它字符\n", x);
return 0;
}

 

 

#include <stdio.h>
int main()
{
int a,n,t,c;
double sum;
while(scanf("%d %d",&n,&a)!=EOF){
t=1;
sum=0;
c=a;
while(t<=n){
    sum = sum + (double)t/a;
        a = a*10+c;
        t++;
}
 printf ("n = %d, a = %d, sum = %f\n",n,c,sum);
}
return 0;
}

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
const int N = 5;
int main()
{
int x, n;
srand(time(0)); 
for (n = 1; n <= N; n++)
{
x = rand() % 100;
printf("%3d", x);
}
printf("\n");
return 0;
}

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main ()
{
    int x,y,i; 
    srand(time(0)) ;
    x = rand()%31 + 1;
    printf("猜猜12月哪一天是你的luck day\n"); 
    printf("开始喽，你有三次机会，猜吧（1~31）：\n"); 
    for (i=1;i<=3;i++)
    {
    scanf ("%d",&y);
    if (x==y){
    printf("猜对啦，恭喜\n"); 
    break;
    }
    else if(y>x)
    printf("你猜的日期晚了，luck day悄悄溜到前面啦\n");
    else if (y<x)
    printf("你猜的日期早了，luck day还没到呢\n");      
    }
    if (i == 4)
    printf("次数用完啦。偷偷告诉你：12月，你的luck day是%d号\n",x); 
    return 0;
}

 

 

#include <stdio.h>

int main ()
{
int n,t;
scanf("%d",&n);
t=1;
while (t<=n){
printf(" o \n");
printf("<H>\n");
printf("| |\n");
printf("\n");
t++;
}
return 0;

}

 

 

#include <stdio.h>

int main ()
{
int t,a,b,n;
scanf("%d",&n);
t=1;
a=1;
b=1;
while (t<=n){
printf(" o   ");
t++;
}
printf("\n");
while (a<=n){
printf("<H>  ");
a++;
}
printf("\n");
while (b<=n){
printf("| |  ");
b++;
}
printf("\n");
return 0;
}

 

 

#include <stdio.h>

int main ()
{
int t,a,b,n,c,e,f,g;
scanf("%d",&n);
n=n*2-1;
c=1;
while(n>=1){ 
t=1;
a=1;
b=1;
e=1;
f=1;
g=1;
while (e<=c){
printf("     ");
e++;
}
while (t<=n){
printf(" o   ");
t++;
}
printf("\n");
while (f<=c){
printf("     ");
f++;
}
while (a<=n){
printf("<H>  ");
a++;
}
printf("\n");
while (g<=c){
printf("     ");
g++;
}
while (b<=n){
printf("| |  ");
b++;
}
printf("\n");
n=n-2;
c=c+1;
}
return 0;
}

总结：最后一个好像长了，应该可以优化。