注：在Visual C++ 6.0编译环境中亲自调试通过，但不保证在Turbo C 中通过。
实验二 选择结构的程序设计（题目当初没抄下来，这是根据程序整理的）1.编程实现分段函数⎪⎩⎪⎨⎧<≤-+-<≤-+<≤--=2112381011030184242x x x x x x x x x y#include<stdio.h> main() { float x,y; printf("Please input x:"); scanf("%f",&x); if (x<-1||x>=2) printf("Data Error\n"); else { if (x>=-1&&x<0) y=4*x-8; if (x>=0&&x<1) y=3*x*x+10*x-1; if (x>=1&&x<2) y=8*x*x*x*x-3*x*x+2*x-1; printf("\ny=%f\n",y); } } 2. 苹果有三个等级，一级5.50元/斤，二级3.00元/斤，三级2.50元/斤。
编写程序，输入苹果的等级，购买的数量和所付的钱数，输出等级，购买的数量、应付钱数和找零。
#include<stdio.h> main() { int level; double weight,pay,money,charge; printf("Please input the level:"); scanf("%d",&level); printf("Please input the weight you want:"); scanf("%lf",&weight); printf("Please input the money you pay:"); scanf("%lf",&pay); if (level<1||level>4||weight<0) printf("Data Error\n"); else{ if (level==1) money=weight*5.50; else if (level==2) money=weight*4.20; else if (level==3) money=weight*3.00; else if (level==4) money=weight*2.50; charge=pay-money; printf("\nLevel:%d\nweight:%g\n",level,weight); printf("money:%g\ncharge:%g\n\n",money,charge); } }实验三循环结构1.编程计算1！+2！+3！+4！+5！●分别用单层循环和双层循环实现●考虑∑∑==201101iiii！和！#include<stdio.h>main(){int i,x;double j,k,sum;printf("Please input a number:");scanf("%d",&x);//用单层循环for(sum=0,j=1,i=1;i<=x;i++){j*=i;sum+=j;}printf("The result is %lf\n",sum);//用双层循环for(sum=0,i=1;i<=x;i++){for(k=1,j=1;j<=i;j++) k*=j;sum+=k;}printf("The result is %lf\n",sum);}2.共20个评委给选手评分，去掉1个最高分，去掉1个最低分，其余18名评委的平均分即选手最终得分#include <stdio.h>main(){double score,min,max,avg=0;int i;//下面是为了输入第一个数printf("Please input 20 scores...\n");printf("Score 1: ");scanf("%lf",&score);min=score;max=score;avg+=score;// 下面为了输入剩余19个数for(i=2;i<=20;i++){do{printf("Score %d: ",i);scanf("%lf",&score);}while(score<0);if(score>max) max=score;avg+=score;}avg=avg-min-max;avg/=18;printf("\nThe average score is %lf:\n",avg);}实验四数组和指针的应用1.定义一个有10元素的一位数组count，从键盘上输入8个整数，将其按从大到小的顺序排列，并将排序后的数组输出（1）数组方法#include<stdio.h>main(){int count[10],t,i,j;printf("Please input 8 numbers:\n");for(i=0;i<8;i++)scanf("%d",&count[i]);for(i=0;i<8;i++)for(j=i+1;j<8;j++)if (count[i]<count[j]){t=count[i];count[i]=count[j];count[j]=t;}printf("The sorted array is as follows:\n");for (i=0;i<8;i++)printf("%d ",count[i]);}（2）指针方法#include<stdio.h>main(){int count[10],t,i,j,*p=count;printf("Please input 8 numbers:\n");for(i=0;i<8;i++)scanf("%d",&p[i]);for(i=0;i<8;i++)for(j=i+1;j<8;j++)if (*(p+i)<*(p+j)){t=*(p+i);*(p+i)=*(p+j);*(p+j)=t;}printf("The sorted array is as follows:\n");for (i=0;i<8;i++)printf("%d ",count[i]);}2.输入2个字符串，将二者连接并输出，再将连接后的字符串反向排列并输出，并求连接后字符串的长度#include<stdio.h>#include<string.h>main(){int i,len;char a1[51],a2[26],t[51];printf("Please input 2 strings:\n");gets(a1);gets(a2);strcat(a1,a2);printf("The joint string is: %s",a1);len=strlen(a1);printf("\nThe length of the linked string is: %d\n",len);for(i=0;i<len;i++)t[i]=a1[len-i-1];t[len]=0;strcpy(a1,t);printf("The reversed string is: %s\n",a1);}实验五函数应用的程序设计1.要求是：编写一函数，统计字符串中字母、数字、空格和其他字符的个数在主函数中输入字符串并输出统计结果值传送：#include<stdio.h>void fun(char a,int *b){if(a>='A'&&a<='Z'||a>='a'&&a<='z')b[0]++;else if(a>='0'&&a<='9')b[1]++;else if(a==32)b[2]++;else b[3]++;}main(){char a[50];int b[4],i,j,k;for(i=0;i<3;i++){for(j=0;j<4;j++)b[j]=0;printf("\nPlease input a string:\n");gets(a);k=0;while(a[k]!=0){fun(a[k],b);k++;}printf("The string have %d letters, %d numbers, %d spaces, %d other chars\n",b[0],b[1],b[2],b[3]);}}地址传递：#include<stdio.h>void fun(char *a,int *b){int i=0;while(a[i] != 0){if(a[i]>='A'&&a[i]<='Z'||a[i]>='a'&&a[i]<='z')b[0]++;else if((a[i]>='0')&&(a[i]<='9'))b[1]++;elseif(a[i]==32)b[2]++;else b[3]++;i++;}}main(){char a[50];int b[4],i,j;for(i=0;i<3;i++){for(j=0;j<4;j++)b[j]=0;printf("\nPlease input a string:\n");gets(a);fun(a,b);printf("\nThe string have %d letters, %d numbers, %d spaces, %d other chars",b[0],b[1],b[2],b[3]);}}。
