C语言程序设计 (何钦铭 颜晖 著) 高等教育出版社第四章 课后答案.docVIP

-练习4－3 #include stdio.h #include math.h void main() { double eps,s,item,flag,denominator; s=0;item=1;flag=1;denominator=1; printf(Enter eps: ); scanf(%lf,eps); while(fabs(item)=eps) { item=flag/denominator; s=s+item; flag=-flag; denominator=denominator+3; } printf(s=%lf\n,s); } 练习4－4 #include stdio.h void main() { int num,n; float score,total=0; num=0;n=0; printf(Please input score # 1 :); scanf(%f,score); while(score=0) { if(score60)num++; total=total+score; n++; printf(Please input score #%d(0~100): ,n+1); scanf(%f,score); } printf(The average score is %.2f.\n,total/n); printf(The numbers between 0 and 59 is %d.\n,num); } 练习4－7 #include stdio.h void main() { int i,j,n,num; printf(Enter n : ); scanf(%d,n); for(i=1;i=n;i++) { printf(Please input an integer : ); scanf(%d,num); for(j=2;j=num-1;j++) if(i%j==0)break; if(jnum-1 num!=1)printf(%d is a prime.\n,num); else printf(%d is not a prime.\n,num); } } 练习4－8 #include stdio.h void main() { int i,j,n; double e,product; e=1; printf(Enter n : ); scanf(%d,n); for(i=1;i=n;i++) { product=1; for(j=1;j=i;j++) product=product*j; e=e+1/product; } printf(e=%.2lf\n,e); } 练习4－11 #include stdio.h void main() { int i,n,min,num; printf(Enter n : ); scanf(%d,n); for(i=1;i=n;i++) { printf(Enter an integer : ); scanf(%d,num); if(i==1)min=num; else if(nummin)min=num; } printf(The Min number is %d.\n,min); } 练习4－12 #include stdio.h void main() { int num1,num2=0,flag=1; printf(Enter an integer : ); scanf(%d,num1); if(num10){flag=-1;num1=-num1;} while(num1!=0) { num2=num2*10+num1%10; num1=num1/10; } num2=flag*num2; printf(The new number is %d.\n,num2); } 练习4－13 #include stdio.h void main() { int i,j,count=0; for(i=100;i=200;i++) { for(j=2;j=i-1;j++) if(i%j==0)break; if(ji-1) { count++; if(count%8==0)printf(%8d\n,i); else printf(%8d,i); } } printf(\n); } 练习4－14 #include stdio.h void main() { int i