实验2
实验一
#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; }
使数字的输出位数为4,不够在前面补零
#include <stdio.h> int main() { int num; while(scanf("%d",&num) != EOF){ printf("2049%04d\n",num); } return 0; }
实验二
#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; }
实验三
#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; }
实验四
#include <stdio.h> int main(){ int n,a; int i=1; double sum = 0.0; double d; scanf("%d %d",&n,&a); while(i<=n){ d = 1.0*i/a; a = a*10+a; i++; sum += d; } printf("%f",sum); return 0; }
实验五
int main() { int x,n; srand(time(0)); for(n = 1;n <= N; n++) { x = rand() % 100; printf("%3d",x); } printf("\n"); }
实验六
#include <stdio.h> #include <stdlib.h> #include <time.h> const int N = 1; int main() { int x,n,a; int b = 0; srand(time(0)); for (n = 1;n <= N; n++) { x = (rand() % 100 + 1) % 31 + 1; } printf("猜猜2021年12月哪一天会是你的 luck day\n"); printf("\n"); printf("开始喽,你有三次机会,猜吧(1~31):"); scanf("%d",&a); do{ b++; if(b>1){ printf("再猜(1~31):"); scanf("%d",&a); } if(a<x){ printf("\n"); printf("你猜的日期早了,luck day还没到呢\n"); printf("\n"); } else if(a>x){ printf("\n"); printf("你猜的日期晚了,luck day悄悄溜到前面啦\n"); printf("\n"); }else if(a == x){ printf("恭喜你猜中了。\n"); break; } }while(b<3); if(a != x){ printf("次数用完啦。偷偷告诉你:12月,你的luck day是%d号\n",x); } return 0; }
实验七
#include <stdio.h> int main() { int n,a; printf("input n:"); scanf("%d",&n); for(a = 0; a<n ; a++){ printf(" O \n"); printf("<H>\n"); printf("I I\n"); printf("\n"); } return 0; }
#include <stdio.h> int main() { int n,a; printf("input n:"); scanf("%d",&n); for(a = 0; a < n; a++){ printf(" O "); printf(" "); } printf("\n"); for(a = 0; a < n; a++){ printf("<H>"); printf(" "); } printf("\n"); for(a = 0; a < n; a++){ printf("I I"); printf(" "); } return 0; }
#include <stdio.h> int main() { int n,a,b,d; int c = 0; printf("input n:"); scanf("%d",&n); for(b = 2*n - 1;n != 0; n--){ b = 2*n - 1; for(a = 0; a < b; a++){ printf(" O "); printf(" "); } printf("\n"); d = c; while(d>0){ printf(" "); d--; } for(a = 0; a < b; a++){ printf("<H>"); printf(" "); } printf("\n"); d = c; while(d>0){ printf(" "); d--; } for(a = 0; a < b; a++){ printf("I I"); printf(" "); } printf("\n"); d = c; while(d>=0){ printf(" "); d--; } c ++; } return 0; }