设计一个程序,显示命令行参数
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设计一个程序,显示命令行参数. #include<iostream.h> //ECH0.CPP main(int argc,char *argv[]) { for(int i=0;i<argc;i++) cout<<argv[i]<<'\t'; cout<<'\n'; }. 设计一个程序,输出环境变量. #include<iostream.h> void main(int argc,char *argv[],char *eve[]) { int i; for(i=0;eve[i];i++)

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设计一个程序,显示命令行参数

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6153738

设计一个程序,显示命令行参数

#include<iostream.h>

//ECH0.CPP

main(int argc,char *argv[])

{

for(int i=0;i<argc;i++)

cout<<argv[i]<<'\t';

cout<<'\n';

}


6153738

设计一个程序,输出环境变量

#include<iostream.h>

void main(int argc,char *argv[],char *eve[])

{

int i;

for(i=0;eve[i];i++)

cout<<"eve["<<i<<"]="<<eve[i]<<'\n';

}


6153738

设计一个程序,完成两个操作数的加、减、乘、除四则运算

#include <iostream.h>

#include <stdlib.h>

float add(float x,float y)

{

cout<<x<<"+"<<y<<"=";

return x+y;

}

float sub (float x,float y)

{

cout<<x<<"-"<<y<<"=";

return x-y;

}


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float mul(float x,float y)

{

cout<<"*"<<y<<"=";

return x*y;

}

float dev(float x,float y)

{

cout<<"/"<<y<<"=";

return x/y;

}


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void main(void)

{

float a,b;

char c;

float(*p)(float,float);

cout<<"输入数据格式:操作数1运算符操作数2\n";

cin>>a>>c>>b;

switch(c){

case'+':p=add;break;

case'-':p=sub;break;

case'*':p=mul;break;

case'/':p=dev;break;

default:cout<<"输入数据的格式不对!\n";exit(1);

}

cout<<p(a,b)<<'\n';

}


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求已知数组各元素和、最大元素、下标为奇数元素之和及各元素平均值

#include<iostream.h>

#include<stdlib.h>

float sum(float*p,int n)

{float sum=0;

for(int i=0;i<n;i++)sum+=*p++;

return sum;

}

float max(float *p,int n)

{float m=* p++;

for(int i=1;i<n;i++){

if(* p>m) m=* p;

p++;}

return m;

}


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float oddsum(float*p,int n)

{

float sum=0;

for(int i=1;i<n;i+=2){

sum+=*p++;

p++;

}

return sum;

}

float ave(float *p,int n)

{return sum(p,n)/n;}

void process(float *p,int n,float(*fp)(float *,int ))

{ cout<<fp(p,n)<<'\n';}


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void main(void)

{

float x[]={2.3,4.5,7.8,345.6,56.9,77,3.34,7.87,200};

int n=sizeof(x)/sizeof(float);

cout<<n<<"个元素之和是:";

process(x,n,max);

cout<<"奇数下标元素之和:";

process(x,n,oddsum);

cout<<n<<"个元素的平均值是:";

process(x,n,ave);

}


6153738

用梯形法求定积分的近似值

#include<iostream.h>

#include<math.h>

float f1(float x)

{return (x+x*x)/(1+sin(x)+x*x);}

float f2(float x)

{return (1+x*x);}

float f3(float x)

{return x/(1+x*x);}


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float jifen(float(*f)(float),float a,float b,int n)

{

float y,h;

int i;

y=(f(a)+f(b))/2;

h=(b-a)/n;

for(i=1;i<n;i++)y+=f(a+i*h);

return(y*h);

}

main()

{

cout<<"第一个积分值:"<<jifen(f1,1,3,1000)<<'\n';

cout<<"第二个积分值:"<<jifen(f2,2,4,1000)<<'\n';

cout<<"第三个积分值:"<<jifen(f3,1,2.5,1000)<<'\n';

}


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设计一个简单的计算器程序

#include<iostream.h>

#include<stdlib.h>

int add(int x,int y)

{

cout<<x<<"+"<<y<<"=";

return x+y;

}

int sub(int x,int y)

{

cout<<x<<"-"<<y<<"=";

return x-y;

}


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int mul(int x,int y)

{

cout<<x<<"*"<<y<<"=";

return x*y;

}

int divi(int x,int y)

{

cout<<x<<"/"<<y<<"=";

return x/y;

}

void OutResult(int a,int b,int(*f)(int ,int))

{cout<<(*f)(a,b)<<endl;}


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void main(int argc,char *argv[])

{int(*fun[4])(int,int)={add,sub,mul,divi};

int i;

if(argc!=4){

cout<<"Usage:command op1 op op2<CR>example:\n";

cout<<"EX 34*25<CR>\n";

exit(1);}

char op=argv[2][0];

switch(op){

case'+':i=0;break;

case'-':i=1;break;

case'*':i=2;break;

case'/':i=3;break;

default: cout<<"Operater is error!\n";

exit(1);}

OutResult(atoi(argv[1]),atoi(argv[3]),fun[i]);

}


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设计一程序,实现动态内存空间的分配

#include<iostream.h>

void main(void)

{int *p1;

float *fp1,(*p)[10];

char *cp1;

p1=new int;

fp1=new float(2.5);

p=(float(*)[10])new float[10];

cp1=new char;

*cp1='A';

for(int i=0;i<10;i++)(*p)[i]=(float)i;

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

cout<<"(*p)["<<i<<"]="<<(*p)[i]<<'\t';

if((i+1)%5==0)cout<<'\n';

}


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*p1=25;

cout<<"*p1="<<*p1<<'\n';

cout<<"*fp1="<<*fp1<<'\n';

cout<<"*cp="<<*cp1<<'\n';

delete p1;

delete fp1;

delete cp1;

delete[10]p;

}


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引用类型变量的使用

#include<iostream.h>

void main(void)

{

int i,&refi=i;

i=100;refi+=100;

cout<<"refi="<<refi<<'\n';

refi*=2;

cout<<"i="<<i<<'\n';

}


6153738

设计一个程序,输入两个整数,使之交换后输出

#include<iostream.h>

void swap1(int *p1,int *p2)

{

int t;

t=*p1;*p1=*p2;*p2=t;

}

void swap2(int &p1,int &p2)

{

int t;

t=p1;p1=p2;p2=t;

}


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void main(void)

{

int x,y;

int a,b;

cout<<"Input values of x and y:";

cin>>x>>y;

swap1(&x,&y);

cout<<"Input values of a and b:";

cin>>a>>b;

swap2(a,b);

cout<<"x="<<x<<"y="<<y<<'\n';

cout<<"a="<<a<<"b="<<b<<'\n';

}


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函数返回值为引用类型

#include<iostream.h>

int &f1(void)

{

static int count;

return ++count;

}

int index;

int &f2(void)

{

return index;}


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void main(void)

{

f1()=100;

for(int i=0;i<5;i++)cout<<f1()<<" ";

cout<<'\n';

int n;

f2()=100;

n=f2();

cout<<"n="<<n<<'\n';

f2()=200;

cout<<"index="<<index<<'\n';

}


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#include <iostream.h>

int ComInt(void*a,void*b)

{ return*(int *)a-*(int*)b;}

int ComFloat(void*a,void*b)

{ return *(float*)a-*(float *)b>0?1:-1;}


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void Sort(void*v,int n,int size,int(*Com)(void*,void*)){

int i,j,k;

char*p,*q,t;

for(i=0;i<n-1;i++){

p=(char*)v+i*size;

for(j=i+1;j<n;j++){

q=(char*)v+j*size;

if(Com(p,q)>0)

for(k=0;k<size;k++){

t=p[k];p[k]=q[k];q[k]=t;

}

}

}

}


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void main(void)

{

int vi[]={23,44,32,66,15,25};

float vf[]={15.4,34.789,55.4,5,6,18,3,99.8,67.34};

cout<<"排序前的整数为:\n";

for(int i=0;i<sizeof(vi)/sizeof(int);i++)cout<<vi[i]<<'\t';

cout<<'\n';

cout<<"排序后的整数为:\n";

for(i=0;i<sizeof(vi)/sizeof(float);i++)cout<<vi[i]<<'\t';

cout<<'\n';

cout<<"排序前的实数为:\n";

for( i=0;i<sizeof(vf)/sizeof(float);i++) cout<<vf[i]<<'\t';

cout<<'\n';

Sort(vf,sizeof(vf)/sizeof(float),sizeof(float),ComFloat);

cout<<"排序后的实数为:\n";

for(i=0;i<sizeof(vf)/sizeof(float);i++)cout<<vf[i]<<'\t';

cout<<'\n';

}


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