c++习题

getchar();
}
There is a class named string in the C++ standard library, whose functionality is providing some useful operations with text strings. This is only a very simple example. You can consult C++ documentation for detail.
for(int i=len-1;i>=0;i--){
BinaryOut(*(p+i));
}
}
int main(){
float d=-28.0;
show((char*)&d,sizeof(d));//using type-cast to fetch bytes
getchar();
}
C++ assignment(3)
cout << "(" <<(int)c<<"," << c <<")" << endl;
}
cout << "(" <<(int)c<<"," <<c<<")" << endl;
getchar();
}
What is the output？The data type char can be considered as integer with single byte. How to output a char variable as an integer? How to output an integer as a char? What is ASCII？
cout << sizeof(char)<<endl;
cout << sizeof(int) << endl;
cout << sizeof(short) << endl;
cout << sizeof(long) << endl;
cout << sizeof(float) << endl;
cout << sizeof(double) << endl;
（4）Inspect this program：
// CString Example
#include<iostream>
#include<cstring>
int main()
{
char s[] = "hello ";
char t[] = { 'w', 'o', 'r', 'l', 'd', '!', '\0' };
#include <iostream>
using namespace std;
//output a single byte as a binary sequence
void BinaryOut(char c){
unsigned char tmp=0x80;
for(int i=0;i<8;i++){
if(c&tmp)
}
int main(){
cout << "Please input n:";
int n;
cin >> n;
cout << "Result of f(" << n << ") is " << factorial(n) << endl;
return 0;
}
C++ assignment(2)
Hi,
Every one!
（3）Write a function that outputs a char variable as a binary sequence。
（4）Output a minus value as a binary sequence. Make clear what thetwo's-complement is, and check it actually.
int main(){
int x=5,y=8;
x = sizeof(y++);
cout << x << endl;
cout << y << endl;
getchar();
}
What is the output？Is it the same as you have expected? Do you know the concepts "Compile-time" and "Run-time"?
（3）Inspect this program：
#include<iostream>
#include<string>
using namespace std;
int main()
{
cout << "What is your name?" << endl;
string s;
cin >> s;
cout << "Hello " <<tput of this program is:
1
1
4
2
4
4
8
(2)
#include <iostream>
using namespace std;
int factorial(int n){
int fac=1;
for(int i=2;i<=n;i++)
fac *=i;
return fac;
cout << 1;
else
cout << 0;
tmp >>=1;
}
}
//output several contiguous bytes form a given address, with the highest byte on the leftmost
void show(char *p,int len){
Following is the C++ assignment for this week.
(1) Inspect this program：
#include <iostream>
using namespace std;
int main(){
char c;
for(c=-128;c<127;c++){
（2）Inspect this program:
#include <iostream>
using namespace std;
int main()
{
int num;
cout << num<<endl;
num=2;
cout <<(num << 1)<<endl;
int n=5;
if(num==2 && n==5)
(2) Write a function int f(int n) to calculate thefactorial of n, then call it in main() function.
The sample source codes will be presented next week
Hi,
// modify the strings directly, replace h with H
s[0] = 'H';
// compare strings
if (strcmp(t, "world!") == 0)
{
strcpy(t, "World!"); //note capital W
}
char *u = strcat (s, t);
（2）Inspect this program：
#include <iostream>
using namespace std;
void BinaryOut(char c){
unsigned char tmp=0x80;
for(int i=0;i<8;i++){
if(c&tmp)
cout << 1;
else
（5）Write a function that outputs a float variable as a binary sequence。（Pointers are used in this function. Ask the teaching assistant for detail.）
（6）Write a program that outputs the greatest common divisor of two integers and the least common multiple of two integers.