如何将getchar,putchar函数改为cin,cout函数

getchar和putchar是C语言中的输入输出函数，而cin和cout是C++中的输入输出流。如果你想在C++中使用cin和cout，只需要在程序开头加上`#include<iostream>`，并在代码中使用`std::cin`和`std::cout`即可。²³

很好用的，功能多··你理解的我帮你解释include <stdioh>

#include <mathh>void SubMain_f(); /下级菜单，四则运算功能/

void SolveForX_f(); / 求一元一次方程解/

void MmToM_f(); / 单位转换：毫米转米/

void InchesToFeet_f(); / 单位转换： 英尺转尺 /

void CelsiusToFahrenheit_f(); / 单位转换：摄氏转绝对温度/

void Quadformula_f(); / 求一元二次方程解/

void SqRoot_f(); / 平方根运算/

void CalcAdd_f(); / 加法运算/

void CalcSub_f(); / 减法运算/

void CalcDiv_f(); / 除法运算/

void CalcMult_f(); / 乘法运算/

void Menu_f(); / 主菜单 /int nNumber1, nNumber2, nResult;int main(void)

{

int nMenuChoice;

Menu_f();

scanf("%d", &nMenuChoice); /now you input the number you want /

switch(nMenuChoice) / this is the long if statment used for the menu effect /

{

case 1:

SolveForX_f(); / Solve for x section/

break;

case 2:

SubMain_f(); /solve for diamond problems /

break;

case 3:

MmToM_f(); / convert mm to m /

break;

case 4:

InchesToFeet_f(); / convert inches to feet /

break;

case 5:

CelsiusToFahrenheit_f(); / code from C++ book that converts cel to farh /

break;

case 6:

SqRoot_f();

break;

case 7:

Quadformula_f();

break;

case 8:

return 0;

default:

printf("Please choose from one of the choices above\n");

break;

}

return 0;

}void Menu_f()

{

printf("\n\t\t Math Homework Helper Version 10 ");

printf("\n 1 Solve For The X Value ");

printf("\n 2 Simple Calculation ");

printf("\n 3 Covert Millimeter To Meter");

printf("\n 4 Covert Feet To Inches ");

printf("\n 5 Covert Celsius To fahrenhiet ");

printf("\n 6 Find the square root of a number");

printf("\n 7 QUADRATIC FORMULA");

printf("\n 8 Exit");

printf("\n Choice:" );

}

void SubMain_f()

{

char chChoice;

system("cls"); / 执行系统命令：cls-清屏 /

printf( "==================MENU===============\n");

printf( "1: Add two numbers\n");

printf( "2: Subtract two numbers\n");

printf( "3: Divide two numbers\n");

printf("4: Multiply two numbers\n");

printf("5: Back MainMenu\n");

printf( "Choice: ");

scanf(" %c", &chChoice);

printf("=====================================\n");

switch (chChoice)

{

case '1':

CalcAdd_f();

break;

case '2':

CalcSub_f();

break;

case '3':

CalcDiv_f();

break;

case '4':

CalcMult_f();

break;

case '5':

return;

default:

printf("Please choose from one of the choices above\n");

break;

}

}

void CalcAdd_f()

{

printf("The Add Function\n");

printf( "First number: ");

scanf("%d", &nNumber1);

printf("Second number: ");

scanf("%d", &nNumber2);

nResult=nNumber1+nNumber2;

printf("%d +%d=%d\n", nNumber1, nNumber2, nResult);

printf( "Press any key to continue\n");

getchar();

getchar();

SubMain_f();

}

void CalcSub_f()

{

printf( "The Subtract Function\n");

printf( "First number: ");

scanf("%d", &nNumber1);

printf( "Second number: ");

scanf("%d", &nNumber2);

nResult=nNumber1-nNumber2;

printf("%d + %d = %d\n", nNumber1,nNumber2 , nResult);

printf("Press any key to continue\n");

getchar();

getchar();

SubMain_f();

}

void CalcDiv_f()

{

printf( "The Divide Function\n");

printf( "First number: ");

scanf("%d", &nNumber1);

printf("Second number: ");

scanf("%d", &nNumber2);

nResult= nNumber1/nNumber2;

printf("%d / %d = %d\n ", nNumber1, nNumber2 , nResult);

printf( "Press any key to continue\n");

getchar();

getchar();

SubMain_f();

}

void CalcMult_f()

{

printf("The Multiply Function\n");

printf( "First number: ");

scanf("%d", &nNumber1);

printf( "Second number: ");

scanf("%d", &nNumber2);

nResult=nNumber1nNumber2;

printf("%d %d= %d\n", nNumber1, nNumber2 , nResult);

printf( "Press any key to continue\n");

getchar();

getchar();

SubMain_f();

}void SqRoot_f()

{

printf("The Square Root Function\n");

printf( "First number: ");

scanf("%d", &nNumber1);

nResult=sqrt(nNumber1);

printf( "The square root of %d is %d\n", nNumber1, nResult);

printf( "Press any key to continue\n");

getchar ();

Menu_f();

}void SolveForX_f()

{

int nCoef, nWholeNumber, nEqual, nX;

printf("\nThis will run you through solving for x in the since that the");

printf("\nProgram reads like y = 2x + 3");

printf("\nOnly put in one number at a time then push enter");

printf("\nMore instructions will come after you put that number in and push enter\n\n");

printf("y = ");

scanf("%d", &nCoef);

printf("%dx + ", nCoef);

scanf("%d", &nWholeNumber);

printf("%dx + %d=", nCoef,nWholeNumber);

scanf("%d", &nEqual);

for(;;)

{

nX = rand()%100;

if(((nCoef nX) + nWholeNumber) == nEqual)

{

printf("\nWe found out that x is equal to %d\n\n", nX);

system("PAUSE");

return ;

}

}

}void MmToM_f()

{

double dlMeter;

double dlMilimeter;

printf("Enter the value in 'Millimeters': ");

scanf("%lf", &dlMilimeter);

if(dlMilimeter < 1000)

{

printf("Way to low buddy Number MUST be over 1000!!!\n");

MmToM_f();

}

dlMeter = (dlMilimeter / 1000);

printf("\nThe answer to your question is: %lf meters\n\n", dlMeter);

return ;

}void InchesToFeet_f()

{

float flFeet;

float flInch;

printf("Enter the number of feet to get the length in inches: ");

scanf("%f", &flInch);

flFeet = 12 flInch;

printf("\n\nOh that is %f feet\n\n", flFeet);

system("PAUSE");

return ;

}void CelsiusToFahrenheit_f()

{

int nFahrenheit;

int nFactor;

int nCelsius;

printf( "Enter the temperature in Celsius:");

scanf("%d", &nCelsius);

nFactor = 212 - 32; nFahrenheit = nFactor nCelsius/100 + 32;

printf( "Fahrenheit value is:%d\n", nFahrenheit);

}void Quadformula_f()

{

int nCoefa, nCoefb, nCoefc;

float flHalfDone;

float flTopA;

float flTopB;

float flWholeA;

float flWholeB;

printf("\nWhat is the value of a: ");

scanf("%d", &nCoefa);

printf("\nWhat is the value of b: ");

scanf("%d", &nCoefb);

printf("\nWhat is the value of c: ");

scanf("%d", &nCoefc);

if (nCoefb < 0)

{

nCoefb +=(nCoefb nCoefb);

}

else

{

nCoefb -=(nCoefbnCoefb);

}

flHalfDone = sqrt( ( (nCoefb nCoefb) - (4 nCoefa nCoefc ) ) );

flTopA = nCoefb + flHalfDone;

flTopB = nCoefb - flHalfDone;

flWholeA = flTopA / (2 nCoefa);

flWholeB = flTopB / (2 nCoefa);

printf("X's Are %f , %f\n", flWholeA , flWholeB);

return ;

}

getchar()是c语言中的一个函数,可以用它来赋一个字符的值。

当程序调用getchar时，程序就等待用户按键并将输入的字符被存放在键盘缓冲区中。getchar函数的返回值是用户输入的第一个字符的ASCII码,如出错返回-1,且将用户输入的字符回显到屏幕。在此之前，如果用户在按回车之前输入了一个以上的字符,那么其他字符会保留在键盘缓存区中,等待后续getchar调用读取。也就是说,后续的getchar调用不会等待用户按键,而直接读取缓冲区中的字符,直到缓冲区中的字符读完为后,才等待用户按键。

getch与getchar基本功能相同,差别是getch直接从键盘获取键值,不等待用户按回车,只要用户按一个键,getch就立刻返回, getch返回值是用户输入的ASCII码,出错返回-1。

以前上课的时候不想做，现在很想补下，很后悔没好好学习呢~希望楼主好好努力

第4道1）：

#include<stdioh>

void main(void)

{

int i,j,a[80],max,max_i;

printf("please input 10 num!\n");

for(i=0;i<10;i++)

scanf("%d",&a[i]);

printf("the 10 num is:\n");

for(i=0;i<10;i++)

printf("%d\t",a[i]);

for(max=a[0],i=0;i<10;i++)

{

if(max<a[i])

{

max=a[i];

max_i=i;

}

}

printf("the max num is:a[%d]=%d\n",max_i+1,max);

getch();

}

2）道：

#include<stdioh>

void main(void)

{

int a[3][2],i,j,sum[3];

for(i=0;i<3;i++)

{

printf("please input the score of the student %d\n",i+1);

scanf("%d%d",&a[i][0],&a[i][1]);

sum[i]=a[i][0]+a[i][1];

}

for(i=0;i<3;i++)

{

printf("the score of the student %d is:%d\t%d\n",i+1,a[i][0],a[i][1]);

printf("the sum score of the student %d is:%d\n",i+1,sum[i]);

}

getch();

}

3）道：

#include<stdioh>

#include<stringh>

main()

{

int i;

char string1[80],string2[80];

printf("please input the string 1\n");

scanf("%s",string1);

printf("please input the string 2\n");

scanf("%s",string2);

if(strcmp(string1,string2)==0)

printf("the 2 string is the same\n");

else

printf("the 2 string is different\n");

getch();

}

第5道：

#include<stdioh>

main()

{

float c,f;

printf("please input the F\n");

scanf("%f",&f);

c=(f-32)5/9;

printf("the convert result is:%2f\n",c);

getch();

}

小问：

float convert(float a)

{

float b;

b=(a-32)5/9;

return b;

}

main()

{

float c,f;

printf("please input the F\n");

scanf("%f",&f);

c=convert(f);

printf("the convert result is %2f\n",c);

getch();

}

第6道：

#include<stdioh>

main()

{

int x,y,p1,p2;

printf("please input the 2 nums;\n");

scanf("%d%d",&x,&y);

swap1(x,y);

printf("the swap1 result is:%d\t%d\n",x,y);

p1=&x;

p2=&y;

swap2(p1,p2);

printf("the swap2 result is:%d\t%d\n",p1,p2);

getch();

}

swap1(int x,int y)

{

int temp;

temp=x;

x=y;

y=temp;

}

swap2(int p1,int p2)

{

int temp;

temp=p1;

p1=p2;

p2=temp;

}

62）

#include <stdioh>

void main()

{

char s[80];/定义一个数组/

char c;

printf("which style you want to:\n");/是\不是|/

printf("capital ( c ) or uncapital(a):");

c=getchar();

if(c=='c')/是==不是=/

strcpy(s,"COMPUTER");

else

strcpy(s,"computer");

puts(s);

getch();

}

第七道

struct student

{

char num[8];

char name[80];

float score;

}stu[4];

main()

{

int i,max,max_i;

for(i=0;i<4;i++)

{

printf("input the num of student %d\n",i+1);

scanf("%s",&stu[i]num);

printf("input the name of student %d\n",i+1);

scanf("%s",&stu[i]name);

printf("input the score of student %d\n",i+1);

scanf("%f",&stu[i]score);

}

for(max=stu[0]score,i=0;i<4;i++)

{

if(max<stu[i]score)

{

max=stu[i]score;

max_i=i;

}

}

printf("the highest score student is student%d\n",max_i+1);

printf("%s\t%s\t%2f\n",stu[max_i]num,stu[max_i]name,stu[max_i]score);

getch();

}

第八道：

Java的行不，C++的不记得了。

public class Circle

{

private static double PI=314

private double radius;

public Circle(double radius)

{

thisradius=radius;

}

public double Area()

{

return PIradiusradius;

}

public double Perimeter()

{

return 2PIradius;

}

}

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