天津理工大学c语言上机报告

1、天津理工大学-c语言上机报告4实验四(2009-9-24)一、实验名称：程序控制结构。二、实验目的：(1)掌握c语言基本程序结构(顺序、分支和循环)及其应用；(2)结合程序理解一些常用的算法(穷举、迭代和递推等)；(3)进一步熟悉VisualC+6.0开发环境下调试程序的基本步骤。三、实验项目(1)源程序:#include<stdio.h>intmain()intx;inty;输入(Input)printf("Enteraninteger:n");scanf("%d",&x);处理(Process)if(x<1)y=x;else

2、if(x<6)y=3*x-2;elsey=4*x-8;输出(Output)printf("y=%dn",y);return0;(2)采用if语句时，源程序为：#include<stdio.h>intmain()intscore;/输入(Input)printf("Enterthescore:n");scanf("%d",&score);处理(Process)和输出(Output)if(score>100|score<0)printf("川egal'n");elseif(

3、score>=90)printf("Excellent'n");elseif(score>=80)printf("Good'n");elseif(score>=70)printf("Middle'n");elseif(score>=60)printf("Passed'n");elseprintf("Failed'n");return0;采用swtich语句时)源程序为:#include<stdio.h>intmain()

4、intscore;输入(Input)printf("Enterthescore:n");scanf("%d”,&score);处理(Process)和输出(Output)switch(score/10)case10:case9:printf("Excellent'n");break;case8:printf("Good'n");break;case7:printf("Middle'n");break;case6:printf("Passed'n"

5、);break;case5:case4:case3:case2:case1:case0:printf("Failed'n");break;default:printf("川egal'n");break;return0;intmain()(3)源程序为：#include<stdio.h>intdatal,data2;charop;doubleresult;输入(Input)printf("Entertheexpression:data1opdata2n");scanf("%d%c%d”,&d

6、ata1,&op,&data2);/处理(Process)switch(op)case'+':result=data1+data2;break;caseresult=data1-data2;break;case'*':result=data1*data2;break;case'/':if(data2!=0)result=data1/data2;elseprintf("Dividedbyzero!n");return1;break;输出(Output)printf("%d%c%d=%7.2fn"

7、;,datal,op,data2,result);return0;(4)源程序为：intmain()intline;intloop;处理(Process)和输出(Output)line=0;for(loop=0;loop<=1000;loop=loop+1)if(loop%13=0&&loop%7=0)printf("%d",loop);+line;if(line%10=0)/每行打印10个数printf("n");printf("n");return0;(5)源程序为：#include<stdio.h&g

8、t;intmain()intloop;intnum;intden;inttmp;doublesum;处理(Process)sum=0;num=2;den=1;for(loop=1;loop<=20;loop=loop+1)sum+=num*1.0/den;tmp=num;num=num+den;den=tmp;输出(Output)printf("sum=%7.2fn",sum);return0;12(6)源程序：#include<stdio.h>intmain()intloop;intnum;intn_even;intsum;输入和处理(Process)sum=0;n_even=0;for(loop=1;loop<=10;loop=loop+1)scanf("%d”,&num);-if(num%2=0)sum+=num;+n_even;输出(Output)printf("偶数之和sum=%dn",sum);printf("偶数的平均数ave=%7.2fn",sum*10/n_even);return0;源程序：#include<stdio.h>intmain()intloop;doublefn;doublefact;doublesum;处理(Proces