二级c语言上机题库及答案

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1、第一套题上机填空：#includedoublefun(doublee){inti,k;doubles,t,x;s=0;k=1;i=2;/**********found**********/x=__1__/4;/**********found**********/while(x__2__e){s=s+k*x;k=k*(-1);t=2*i;/**********found**********/x=__3__/(t*t);i++;}returns;}main(){doublee=1e-3;printf("Theres

2、ultis:%f",fun(e));第一处答案：3.0第二处答案：>第三处答案：（2*i+1）或者(t+1)上机改错题：#include/************found************/voidfun(intn){inta,b,c,k;doubles;s=0.0;a=2;b=1;for(k=1;k<=n;k++){/************found************/s=s+(Double)a/b;c=a;a=a+b;b=c;}returns;}main(){intn=5;printf("

3、nThevalueoffunctionis:%lf",fun(n));}第一处改错：将：voidfun(intn)改为doublefun(intn)第二处改错：s=s+(Double)a/b;改为s=s+(double)a/b;第二套题上机填空题#includedoublefun(intn){inti;doubles,t;/**********found**********/s=__1__;/**********found**********/for(i=1;i<=__2__;i++){t=2.0*i;/***

4、*******found**********/s=s+(2.0*i-1)*(2.0*i+1)/__3__;}returns;}main(){intn=-1;while(n<0){printf("Pleaseinput(n>0):");scanf("%d",&n);}printf("Theresultis:%f",fun(n));第一处空答案：0第一处空答案：n第三处空答案：（t*t）改错题#includeintfun(char*str,char*substr){inti,j,k,num=0;/*******

5、*****found************/for(i=0,str[i],i++)for(j=i,k=0;substr[k]==str[j];k++,j++)/************found************/If(substr[k+1]==''){num++;break;}returnnum;}main(){charstr[80],substr[80];printf("Inputastring:");gets(str);printf("Inputasubstring:");gets(substr);printf("

6、%d",fun(str,substr));}第一处错误：for(i=0,str[i],i++)改为for(i=0;str[i];i++)第二处错误：If(substr[k+1]=='')改为if(substr[k+1]=='')即是将”If”改为”if”第三套题填空题#includevoidfun(char*s,int*t){inti,n;n=0;/**********found**********/for(i=0;___1___!=0;i++)/**********found**********/if

7、(s[i]>='0'&&s[i]<=___2___)n++;/**********found**********/___3___;}main(){chars[80]="abcdef35adgh3kjsdf7";intt;printf("Theoriginalstringis:%s",s);fun(s,&t);printf("Theresultis:%d",t);}第一空：s[i]第二空：’9’第三空：*t=n改错题：#includeintfun(int*x,inty){intt;/*********

8、*****found**************/t=x;x=y;/**************found**************/return(y);}main(){inta=3,b=8;printf("%d%d",a,b)