练习题

#include<stdio.h>//阶乘的运算
#include<stdlib.h>
int Factor(int num){
 int result = 1;
 for (int i = 1; i <= num; i++){
  result *= i;
 }
 return result;
}

int main(){

 printf("%d\n", Factor(5));

 

 system("pause");
 return 0;
}

 

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(){
 char arr1[] = "welcome to home!";
 char arr2[] = "##############";
 int left = 0;
 int  right = strlen(arr2)-1;
 while (left <= right){
  arr2[left] = arr1[left];
  arr2[right] = arr1[right];
  printf("%s\n", arr2);
  left++;
  right--;
  
 }

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(){
 int i = 0;
 for (int i = 0; i < 3; i++){
  printf("请输入密码：");
  char passwd[1024] = { 0 };
  scanf("%s", passwd);
  if (strcmp(passwd, "888888") == 0){
   printf("登录成功；\n");
   break;
  }
  else{
   printf("登陆失败；\n");
  }
  if (i == 3){
   printf("登陆失败；\n");
  }
 
 
 }
system("pause");
return 0;
}