大一C语言题库.doc

一、:当x<0时,y=-1;当x=0时,y=0;当x>0时,y=1。编一程序,输入x的值,输出y的值。#include<>intmain(){ intx,y; scanf("%d",&x);if(x>=0)if(x>0)y=1;elsey=0;elsey=-1;printf("x=%d,y=%d\n",x,y);return0;},将这三个数按由大到小的顺序排列,并输出这三个数。#include<>intmain(){floata,b,c,t;scanf("%f,%f,%f",&a,&b,&c);if(a<b){t=a;a=b;b=t;}if(a<c){t=a;a=c;c=t;}if(b<c){t=b;b=c;c=t;}printf("%,%,%\n",a,b,c);return0;},b,c,由键盘输入,输出其中最大者。#include<>intmain(){inta,b,c,max;printf("请输入a,b,c\n");scanf("%d,%d,%d",&a,&b,&c);max=a;if(max<b)max=b;if(max<c)max=c;printf("最大的数为%d\n",max);return0;}、圆周长。要求圆半径由键盘输入,输出时要求有文字说明,取小数点后两位数字。#include<>voidmain(){floatr,l,s;floatpi=;printf("表输入圆半径r:");scanf("%f",&r);l=2*pi*r;s=pi*r*r;printf("圆周长为:l=%\n",l);printf("圆面积为:s=%\n",s);}:当x<-10时,y=|x|+5;当-10≤x≤10时,y=4x-8;当x>10时,y=sqrt(x)。编一程序,输入x的值,输出y的值。#include<>intmain(){ intx,y; scanf("%d",&x); if(x<-10) y=abs(x)+5; elseif(x<=10) y=4*x-8; elsey=sqrt(x); printf("x=%d,y=%d\n",x,y); return0;},判断某一年是否是闰年。(闰年的条件是:能被4整除,但是不能被100整除,或者可以被400整除。)#include<>intmain() {intyear,leap;printf("enteryear:");scanf("%d",&year);if(year%4==0)if(year%100==0) if(year%400==0)leap=1;elseleap=0; elseleap=1;elseleap=0;if(leap)printf("%dis",year);elseprintf("%disnot",year);printf("aleapyear.\n");return0;},要求输出摄氏温度,输出时要求有文字说明,取小数点后两位数字。公式为c=5/9(f-32)#include<>intmain(){floatc,f;printf("请输入一个华氏温度:");scanf("%f",&f);c=()*(f-32);printf("摄氏温度为:%\n",c);return0;}:当x<1时,y=|x|;当1<=x<10时,y=2x-1;当x>=10时,y=3x+11。编一程序,输入x的值,输出y的值。#include<>#include<>voidmain(){intx,y;printf("输入x:");scanf("%d",&x);if(x<1)y=abs(x);elseif(x<10)y=2*x-1;elsey=3*x+11;printf("x=%3d,y=%d\n",x,y);},将这三个数按由小到大的顺序排列,并输出这三个数。main(){inta,b,c,*p1,*p2,*p3,t;scanf("%d,%d,%d",&a,&b,&c);p1=&a;p2=&b;p3=&c;if(*p1>*p2){t=p1;p1=p2;p2=t;}if(*p1>*p3){t=p1;p1=p3;p3=t;}if(*p2>*p3){t=p2;p2=p3;p3=t;}printf("%d,%d,%d\n",*p1,*p2,*p3);},判断它是否是小写字母,如果是,将它转换成大写字母;如果不是,不转换。然后输出