C语言程序设计第四六章习题和课堂测试答案.docVIP

C语言程序设计第四五六章习题和课堂测试答案，还有期末C语言复习例题//3--1矩形面积 #includestdio.hvoid main(){float a,b;float c,area;printf(n\Please Input a,b:);scanf(%f%f,a,b);c=(a+b)*2;area=a*b;printf(c=%f,area=%f\n,c,area);}//3--2输入三位数，输出它各个数位上的数字#includestdio.hvoid main(){int m,a,b,c;printf(\nPlease Input 三位整数:);scanf(%d,m);a=m/100;b=m/10%10;c=m%10;printf(a=%d,b=%d,c=%d\n,a,b,c);}//3--3大写字母转换#includestdio.hvoid main(){char ch;printf(\nPlease Input 大写字母:);scanf(%c,ch);ch=(ch=Ach=Z)?ch=ch+32:ch;printf(ch=%c\n,ch);}//3--3大写字母转换方法二#includestdio.hvoid main(){char ch;printf(\nPlease Input 大写字母:);scanf(%c,ch);if (ch=Ach=Z)ch=ch+32;printf(ch=%c\n,ch);}//4--1已知圆半径和高，求周长，面积，表面积，体积和圆柱体积#define PI 3.14#includemath.h#includestdio.hvoid main(){double r,h,c,area,s,v,u;printf(\n请输入圆的半径和高:);scanf(%lf%lf,r,h);c=2*PI*r;area=PI*pow(r,2);s=4*PI*pow(r,2);v=4.0/3*PI*pow(r,3);u=PI*pow(r,2)*h;printf(c=%lf,area=%lf,s=%lf,v=%lf,u=%lf\n,c,area,s,v,u);}//4--2输入华氏温度求摄氏温度#includestdio.hvoid main(){float F,C;printf(\n请输入F:);scanf(%f,F);C=(F-32)*5/9;printf(C=%f\n,C);}//4--3输入五位整数，将它反向输出#includestdio.hvoid main(){int m,a,b,c,d,e,f;printf(请输入五位整数:);scanf(%d,m);a=m/10000;b=(m-a*10000)/1000;c=(m-a*10000-b*1000)/100;d=(m-a*10000-b*1000-c*100)/10;e=m-a*10000-b*1000-c*100-d*10;f=e*10000+d*1000+c*100+b*10+a;printf(%d对调后是%d\n,m,f);}//4--4人口#includemath.h#includestdio.hvoid main(){double n,r;r=0.8/100;n=log(2)/log(r+1) ;printf(\n%lf年后我国人口超过26亿,n);} //4--5求二点间的距离#includemath.h#includestdio.hvoid main(){float x1,y1,x2,y2,l;printf(请输入平面坐标系中二个点的坐标x1 y1 x2 y2:);scanf(%f%f%f%f,x1,y1,x2,y2);l=pow(pow(x1-x2,2)+pow(y1-y2,2),0.5);printf(二点之间的距离为l=%f\n,l);}//求两点间的距离方法2#includemath.h#includestdio.hvoid main(){float x1,y1,x2,y2,l;printf(请输入平面坐标系中二个点的坐标x1 y1 x2 y2:);scanf(%f%f%f%f,x1,y1,x2,y2);l=sqrt(pow(x1-x2,2)+pow(y1-y2,2));printf(二点之间的距离为l=%f\n,l);}//4--6矩形草坪，求所需时间#define V 0.18#includestdio.hvoid main(){float a,b,t;printf(请输入矩形草坪的长