第5章习题参考答案.doc

'《实用C语言简明教程》第5章习题参考答案5-1D5-2B5-3(1)#include"stdio.h"main(){inti=0,a=0;while(i<20){for(;;)if(i%10==0)break;elsei--;i+=11;a+=i;}printf("%dn",a);}输出结果：32(2)#include"stdio.h"main(){inti,j,b=0;for(i=0;i<3;i++)for(j=0;j<2;j++)if(j>=i)b++;printf("%dn",b);}输出结果：35-4#include"stdio.h"main() {ints,n;s=0;n=0;while(s<1000){n++;s+=n*n;}printf("n=%d,s=%dn",n-1,s-n*n);}输出结果：n=13，s=8195-5#include"stdio.h"main(){intj,x,max,min,sum;floatave;printf("Enter10number:n");scanf("%d",&x);sum=max=min=x;for(j=2;j<=10;j++){scanf("%d",&x);sum+=x;if(x>max)max=x;elseif(x=1.0e-12){sum+=x;i++;}}while(x>=1.0e-12);pi=sqrt(sum*6);printf("Thepiis%fn",pi);}5-8#include"stdio.h"main(){longx,sum=0;printf("enterainteger:n");scanf("%ld",&x);do{sum+=x%10;x=x/10;}while(x!=0);printf("Thesumis%ldn",sum);}5-9#include"stdio.h"main(){charc,ei=0,ni=0,si=0;printf("enterastring:n");for(;;) {c=getch();printf("%c",c);if((c>="a"&&c<="z")||(c>="A"&&c<="Z"))ei+=1;elseif(c>="0"&&c<="9")ni+=1;elseif(c==32)si+=1;elseif(c==13)break;elseprintf("entererror!");}printf("Theletter:%dnnumber:%dnspace:%d",ei,ni,si);}5-10#include"stdio.h"main(){longa,product=1,i;printf("nPleaseenterainteger:n");scanf("%ld",&a);for(i=2;i