C語(yǔ)言循環(huán)結(jié)構(gòu)編程題

1、?教材P74,第4,6題?4題：?#include<>?voidmain()?intn,sum=0;?for(n=1;n<=100;n=n+2)?sum=sum+n;?printf(“奇數(shù)之和為：%dn”,sum);?6題：?#include<>?voidmain()?intn=1,m=1;?do?m=m*n;?n=n+1;?while(n<=10);?printf(“10!=%dn”,m);?3.輸入一行字符，統(tǒng)計(jì)其中英文字母的個(gè)數(shù)。?#include<>?voidmain()?charch;intn=0;?printf(“請(qǐng)輸入一行字符：”)

2、;?scanf(“%c”,&ch);while(ch!=n)if(ch>=a&&ch<=z|ch>=A&&ch<=Z)n+;scanf(“%c”,&ch);printf(“您輸入了d個(gè)英文字母n,n);?4.輸入一批正整數(shù)(以負(fù)數(shù)結(jié)束)，求其中的奇數(shù)和。#include<>voidmain()intn,sum=0;printf(“請(qǐng)輸入若干正整數(shù)，以負(fù)數(shù)結(jié)束:n”);scanf(“%d”,&n);while(n>0)if(n%2!=0)sum=sum+n;scanf(“%d”,&n);pr

3、intf(“奇數(shù)之和等于：%dn”,sum);5、輸出公元2000年至3000年間的所有閏年的年號(hào)。#include<>voidmain()intyear,m;for(year=2000;year<=3000;year+=4)if(year%100!=0|year%400=0)printf(“%d”,year);m+;if(m%5=0)printf(“n”);?P74習(xí)題,第2題，第7題。第2題：#include<>voidmain()intn,m;n=1;while(n<=9)m=1;while(m<=n)printf(“%d*%d=%d“,m,n,

4、n*m);m+;printf(“n”);n+;第7題：#include<>voidmain()inti,j,n;printf(“請(qǐng)輸入打印的行數(shù)：”);scanf(“%d”,&n);for(i=1;i<=n;i+)for(j=1;j<=n-i;j+)printf("");for(j=1;j<=2*i-1;j+)printf("*");printf("n");?打印所有水仙花數(shù)。如：153=13+53+33voidmain()intn,d,t,h;printf("所有水仙花數(shù)：n"

5、;);for(n=100;n<=999;n+)d=n%10;t=n/10%10;h=n/100;if(n=d*d*d+t*t*t+h*h*h)printf("%dn",n);計(jì)算分?jǐn)?shù)數(shù)列前20項(xiàng)之和voidmain()floata,b,t,sum;inti;a=1;b=2;sum=0;for(i=1;i<=20;i+)sum=sum+b/a;t=a;a=b;b=b+t;printf("數(shù)列之和是：fn”,sum);解一元二次方程#include<>#include<>voidmain()floata,b,c,x1,x2,d;ch

6、ars;doprintf("請(qǐng)輸入a,b,c的值:n");scanf("%f%f%f",&a,&b,&c);d=b*b-4*a*c;if(d>0)x1=(-b+sqrt(d)/(2*a);x2=(-b-sqrt(d)/(2*a);printf("方程有兩個(gè)不等實(shí)根：n");printf("x1=%f,x2=%fn",x1,x2);elseif(d=0)x1=x2=-b/(2*a);printf("方程有一個(gè)實(shí)根:n");printf("x1=x2=%fn",x1);elseprintf("方程無(wú)實(shí)根n&