实验二三参考答案

实验二2_2.#include<stdio.h>int main(void){printf("The size of int is %d.\n",sizeof(int));printf("The size of long is %d.\n",sizeof(long));printf("The size of float is %d.\n",sizeof(float));printf("The size of double is %d.\n",sizeof(double));printf("The size of char is %d.\n",sizeof(char));return 0;}2_5.#include<stdio.h>int main(void){printf("1: %c\n",’E’);printf("2: %c\n",’\105’);printf("3: %c\n",’\x45’);return 0;}2_7.#include<stdio.h>int main(void){int length,width,height,volume;printf("please input length,width,height:");scanf("%d,%d,%d",&length,&width,&height);volume=length*width*height;printf("the volume is %d\n",volume);return 0;}2_8.#include<stdio.h>int main(void){enum color{Red,Green,Blue};enum color R,G,B,*pr,*pg,*pb;R=Red;G=Green;B=Blue;pr=&R;pg=&G;pb=&B;printf("%d-%d-%d\n",*pr,*pg,*pb);return 0;}实验三3_2.#include<stdio.h>#include<conio.h>int main(void){unsigned int a,b,n,mode;clrscr();scanf("%u",&a);n=16; b=a; mode=0x8000;printf("%u in binary format is:",a);while(n>0){printf("%d",b/mode); /*输出一位*/b=b%mode;mode=mode/2;n=n-1;}printf("\n");return 0;}3_3.#include<stdio.h>#include<conio.h>#include<math.h>int main(void){float num,,sign,deci;int inte;clrscr();printf("please input a real number:");scanf("%f",&num);if(num>0)printf("sign:+\n");else if(num<0)printf("sign:-\n");else printf("sign:0\n");inte=num;deci=num-inte;printf("integral part: %d\n",abs(inte));printf("decimal fraction part: %f\n",fabs(deci));return 0;}3_4.#include<stdio.h>#include<conio.h>int main(void){unsigned int num,kilobit,cenbit,tenbit,indivbit;clrscr();scanf("%u",&num);kilobit=num/1000;cenbit=num/100%10;tenbit=num/10%10;indivbit=num%10;printf("%u can be seperated to:%u-%u-%u-%u\n",num,kilobit,cenbit,tenbit,indivbit);return 0;}3_5.#include<stdio.h>#include<conio.h>#include<math.h>int main(void){double x,y,a,b,c,d,e;clrscr();printf("input two numbers:");scanf("%lf,%lf",&x,&y);a=sin(x);b=cos(x);c=fabs(x);d=exp(x);e=pow(x,y);printf("sin(%f)=%f\n",x,a);printf("cos(%f)=%f\n",x,b);printf("|%f|=%f\n",x,c);printf("exp(%f)=%f\n",x,d);printf("pow(%f,%f)=%f\n",x,y,e);return 0;}3_6.#include<stdio.h>#include<conio.h>#include<math.h>int main(void){int a,b,c;float s,area;clrscr();printf("input the length of triangle: ");scanf("%d,%d,%d",&a,&b,&c);s=(a+b+c)/2.0;area=sqrt(s*(s-a)*(s-b)*(s-c));printf("the area of triangle is:%f\n",area);return 0;}3_7.#include<stdio.h>#include<conio.h>int main(void){float num=100.453627;clrscr();printf("%f->%10.1f\n",num,num);printf("%f->%10.2f\n",num,num);printf("%f->%10.3f\n",num,num);printf("%f->%10.4f\n",num,num);return 0;}3_8.#include<stdio.h>#include<conio.h>int main(void){char p1name,p2name;float p1math,p1phy,p1chem;float p2math,p2phy,p2chem;float p1average,p1sum;float p2average,p2sum;clrscr();printf("Please input student 1's name:");scanf(" %c",&p1name);printf("Math:");scanf("%f",&p1math);printf("Physics:");scanf("%f",&p1phy);printf("Chemstry:");scanf("%f",&p1chem);p1sum=p1math+p1phy+p1chem;p1average=p1sum/3;printf("Please input student 2's name:");scanf(" %c",&p2name);printf("Math:");scanf("%f",&p2math);printf("Physics:");scanf("%f",&p2phy);printf("Chemstry:");scanf("%f",&p2chem);p2sum=p2math+p2phy+p2chem;p2average=p2sum/3;printf("***************************************************\n");printf("* NAME MATH PHYSICS CHEMSTRY SUM A VERAGE *\n");printf("*%5c%7.1f%8.1f%9.1f%6.1f%8.1f *\n",p1name, p1math,\p1phy,p1chem,p1sum,p1average);printf("*%5c%7.1f%8.1f%9.1f%6.1f%8.1f *\n",p2name, p2math,\p2phy,p2chem,p2sum,p2average);printf("***************************************************\n");return 0;}。