c语言基本编程题.doc

.实用文档.C程序设计编程题1.输入2个整数，求两数的平方和并输出。#include<stdio.h>voidmain(){intta,b,s;printf("pleaseinputa,b:\n");scanf("%d%d〞,&a,&b);s=a*a+b*b;printf("theresultis%d\n",s);}2.输入一个圆半径〔r〕，当r>＝0时，计算并输出圆的面积和周长，否那么，输出提示信息。#include<stdio.h>#voidmain(){floatr,s,l;printf("pleaseinputr:\n");scanf("%f〞,&r);if(r>=0){s=pi*r*r;l=2*i*r;printf("theareais%f\n",s);printf("thecircumferenceis%f\n",l);}elseprintf("inputerror!\n");}3、函数y=f(x)可表示为：2x+1(x<0)y=0(x=0)2x-1(x>0)编程实现输入一个x值，输出y值。#include<stdio.h>voidmain(){intx,y;scanf(“%d〞,&x);if(x<0)y=2*x+1;elseif(x>0)y=2*x-1;elsey=0;printf(“%d〞,y);}4、编写一个程序,从4个整数中找出最小的数,并显示此数。#include<stdio.h>voidmain(){inta,b,c,d,t;scanf(“%d,%d,%d,%d〞,&a,&b,&c,&d);if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(a>d){t=a;a=d;d=t;}printf(“min=%d\n〞,a);}5．有一函数当x<0时y=1，当x>0时，y=3，当x=0时y=5，编程，从键盘输入一个x值，输出y值。#include<stdio.h>voidmain(){intx,y;scanf("%d",&x);if(x<0)y=1;elseif(x==0)y=5;elsey=3;printf("x=%d,y=%d\n",x,y);}6．从键盘输入两个数，求出其最大值〔要求使用函数完成求最大值，并在主函数中调用该函数〕#include<stdio.h>floatmax(floatx,floaty);voidmain(){floata,b,m;scanf("%f,%f",&a,&b);m=max(a,b);printf("Maxis%f\n",m);}floatmax(floatx,floaty){floattemp;if(x<y){temp=x;x=y;y=temp;}return(x);}7、从键盘输入你和你朋友的年龄，编成判断谁的年龄最大，并打印最大者的年龄。#include<stdio.h>voidmain(){intyourAge,hisAge;printf("Pleaseenteryourage:");scanf("%d",&yourAge);/*输入你的年龄yourAge*/printf("Pleaseenteryourfriend'sage:");scanf("%d",&hisAge);/*输入你朋友的年龄hisAge*/if(yourAge>=hisAge){printf("Youareolder!Yourageis=%d\n",yourAge);}if(hisAge>yourAge){printf("Yourfriendisolder!HisAgeageis=%d\n",hisAge);}}8、键盘输入2个加数，再输入答案，如果正确，显示“right〞，否那么显示“error〞#include“〞voidmain(){inta,b,c;printf(“pleaseinputaandb\n〞);scanf(%d,%d〞,&a,&b);printf(“pleaseinputtheanswerfora+b\n〞);scanf(%d〞,&c);if(c==a+b)printf(“right\n〞);elseprintf(“error\n〞);}9.编一程序每个月根据每个月上网时间计算上网费用，计算方法如下：要求当输入每月上网小时数,显示该月总的上网费用(6分)#include<stdio.h>voidmain(){inthour;floatfee;printf(“pleaseinputhour:\n〞);scanf(“%d〞,&hour);if(hour<=10)fee=30;elseif(hour>=10&&hour<=50)fee=3*hour;elsefee=hour*2.5;printf(“Thetotalfeeis%f〞,fee);}10