文档介绍：实验 2-5 /* // 实验 2-1 计算包含周及天数#include "" void main() { int day; int week,d; printf("jPlease input a day:\n"); scanf("%d",&day); week=day/7; d=day%7; printf("The days has %dweeks and %ddays\n",week,d); } // 实验 2-2 大小写转换#include "" void main() { char ch; printf(" 输入一个大写字母:\n"); scanf("%c",&ch); ch=ch+32; printf(" 对应小写字母为:%c\n",ch); } // 实验 2-4 计算圆、球#include "" #define PI void main() { double r,s,area,surface,v; printf(" 输入半径:\n"); scanf("%lf",&r); s=*PI*r; area=PI*r*r; surface=*PI*r*r; v=*PI*r*r*r; printf(" 圆周长: %lf ,圆面积: %lf ,球表面积: %lf ,球体积: %lf\n",s,area,surface,v); } // 实验 3-1 计算华氏转摄氏温度#include "" void main() { double F,C; printf(" 输入华氏温度:\n"); scanf("%lf",&F); C=*(F-32); printf(" 华氏温度: %lf ,摄氏温度: %lf\n",F,C); } // 实验 3-2 计算电阻#include "" void main() { double r,r1,r2,r3; printf(" 输入 3 个电阻值:\n"); scanf("%lf%lf%lf",&r1,&r2,&r3); r=/(++); printf(" 并联电阻: %lf\n",r); } // 实验 3-3 计算梯?面积#include "" void main() { double h,r1,r2,s; printf(" 输入梯??、???:\n"); scanf("%lf%lf%lf",&h,&r1,&r2); s=(r1+r2)*h/2; printf(" 梯?面积: %.2lf\n",s); } // 实验 3-4 计算???度#include "" #include "" #define ??.0?24 #define ??.371??#define PI void main() { double T,?; printf(" 输入??周?:\n"); scanf("%lf",&T); ?=pow(?.?7?-11*?*T*T/(*PI*PI),)-?; printf(" ???度: %.4le\n",?); } // 实验 4-1 ??字???#include "" void main() { char ch; printf(" 输入字?:\n"); ch=?etchar(); if((ch?=?5&&ch?=90)??(ch?=?a?&&ch?=???)) printf("The char %c is ?lpha\n",ch); else if(ch?=?0?&&ch?=?9?) printf("The char %c is numeric\n",ch); else printf("The char %c is other\n",ch); } // 实验 4-2 ?????#include "" void main() { int a; printf(" 输入一个??数:\n"); scanf("%d",&a); if(a%2==1) printf("The num %d is ?dd number\n",a); else printf("The num %d is ?ven number\n",a); } // 实验 4-3 计算?数#include "" #include "" void main() { double ?,y; printf(" 输入一个实数:\n"); scanf("%lf",&?); if(??-1) y=?*?*?-1; else if(??=1) y=-3*?+1; else i