作业第三次上机2将小写字母换成大写字母

求所有水仙花数

#include<iostream>usingnamespacestd;

intmain()

{

intsum,n,a,b,c;for(n=100;n<=999;n++){

a=n/100;b=n/10-a*10;

c=n-a*100-b*10;sum=a*a*a+b*b*b+c*c*c;if(sum==n)

cout<<n<<endl;

}

return0;

}

将小写字母换成大写字母

#include<iostream>usingnamespacestd;intmain(){

charstr[100];inti=0;

cout<<"输入小写字母";cin.getline(str,100);

if(str[i]<'a'||str[i]>'z')cout<<"输入的不是小写字母"<<endl;else{

do{

str[i]-=32;

}while(str[++i]!='\0');cout<<str<<endl;}

return0;

}

设计函数计算两数的最大公约数和最小公倍数

#include<iostream>usingnamespacestd;

int(intnum1,intnum2){intresd;

do{

resd=num1%num2;if(resd==0) break;

num1=num2; num2=resd;

}while(resd!=0);returnnum2;

}

intLCM(intnum1,intnum2){intnum3,num4;

num3=(num1,num2);num4=num1*num2/num3;returnnum4;

}

intmain(){

inta,b;

cout<<"输入两个整数："<<endl;cin>>a>>b;

cout<<a<<"和"<<b<<"的最大公约数为："<< (a,b)<<endl;cout<<a<<"和"<<b<<"的最小公倍数为："<<LCM(a,b)<<endl;

return0;

}

编程求和

#include<iostream>usingnamespacestd;intmain(){

inta,s=0,i,n,m;

cout<<"请输入1~9中任意数字a=";cin>>a;

if(a<0||a>9){

cout<<"输入错误，请重新输入"<<endl;

return1;

}

cout<<"请输入最大位数n=";cin>>n;

m=0;

for(i=0;i<n;i++){

m=m*10+a;s=s+m;

}

cout<<"s="<<s<<endl;return0;

}

输入日期计算出是本年的第几天

#include<iostream>usingnamespacestd;intmain()

{

intyear,month,day,sum=0,i;

inta[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};

intb[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};

cout<<"请输入年份及日期：";cin>>year>>month>>day;

if(year>0&&month>0&&month<13&&day>0&&day<32)

{

if(year%400==0||(year%4==0&&year%100!=0))

{

if(day<=a[month])

{

for(i=1;i<month;i++)sum+=a[i];sum+=day;

cout<<year<<"年"<<month<<"月"<<day<<"日是"<<year<<"年的第"<<sum<<"天."<<endl;

}

elsecout<<"天数输入错误！"<<endl;

}

else

{

if(day<=b[month])

{

for(i=1;i<month;i++)sum+=b[i];sum+=day;

cout<<year<<"年"<<month<<"月"<<day<<"日是"<<year<<"年的第