C程序设计第5章外部类型（ extern ）.ppt

* * * * * * * * * #include <iostream.h> void main() { double p,t,sum_e; int i = 1; p = 1; sum_e = 1; do { p=p*i; // 计算i的阶乘 t=1/ p; sum_e=sum_e+t; i = i + 1; //为计算下一项作准备 }while(t>0.00001); cout<<sum_e<<endl; } * #include <iostream.h> #include <math.h> #include<iomanip.h> #include <stdlib.h> void main() { int max, min,x; x=rand()%101+100; //产生一个[100, 200]之间的随机数x cout<<setw(4)<<x; max = x; min =x; // 设定最大数和最小数 for(int i=1;i<10;i++) { x=rand()%101+100; //再产生一个[100, 200]之间的随机数x cout<<setw(4)<<x; if(x > max)max = x; // 若新产生的随机数大于最大数，则进行替换 if(x < min)min = x; // 若新产生的随机数小于最小数，则进行替换 } cout<<endl<<"最大数："<<max<<",最小数:"<<min<<endl; //输出最大和最小数 } * #include <iostream.h> #include <math.h> #include<iomanip.h> void main() { int x,y,z; for(x=0;x<=100;x++) //可优化为x<=19 for(y=0 ;y<100;y++)// 可优化为y<=33 { z=100-x-y; if(5*x+3*y+z/3.0==100) cout<<setw(5)<<x<<setw(5)<<y<<setw(5)<<z<<endl; } } * * #include <iostream.h> void main() { int score; cout << "请输入成绩"; cin >> score; if (score >= 90) cout << "优 " << endl; else if( (score >= 80) && (score < 90) ) cout << "良 " << endl; else if( (score >= 70) && (score < 80) ) cout << "中 " << endl; else if( (score >= 60) && (score < 70) ) cout << "及格 " << endl; else cout << "不及格 " << endl; } * #include <iostream.h> void main( ) { char ch; cin>>ch; ch=(ch>='A' && ch<='Z')?(ch+32):ch; //判别ch是否大写字母，是则转换 cout<<ch<<endl; } * #include<iostream.h> void main() { int score; int a; cout<<"Input score(0~100):"; cin>>score; a=score/10; switch(a) { case 10: case 9: cout << "优 " << endl; break; case 8: cout << "良 " << endl; break; case 7: cout << "中 " << endl; break; case 6: cout << "及格 " << endl; break; default: cout<<"不及格" << endl; } } * #include <iostream.h> void main( ) { int i=1,sum=0; while (i<=100) { sum=sum+i; i++; } cout<<"sum="<<sum<<endl; } *