分支结构例题

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1、【源程序1】大小写转换示例。#includemain(){charc1,c2;scanf("%c",&c1);printf("%c,%d",c1,c1);c2=c1+32;printf("%c,%d",c2,c2);getch();}【源程序2】求三角形的面积。#includemain(){floata,b,c,s,area;scanf("%f,%f,%f",&a,&b,&c);s=1.0/2*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s

2、-c));printf("%f",area);getch();}3,4,5修改后#includemain(){floata,b,c,s,area;scanf("%f%f%f",&a,&b,&c);s=1.0/2*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s-c));printf("%f",area);getch();}345再修改#includemain(){floata,b,c,s,area;scanf("%f%f%f",&a,&b,&c

3、);if(a+b>c&&b+c>a&&a+c>b){s=1.0/2*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%6.2f",area);}elseprintf("Itisnotatrilateral.");getch();}【源程序3】逻辑运算符短路求值示例。#includemain(){inta=1,b=2,c=3,d=4,m=1,n=1;intx;x=(m=a>b)&&(n=c>d);printf("x=%d3"

4、,x);printf("m=%d,n=%d",m,n);getch();}修改后#includemain(){inta=1,b=2,c=3,d=4,m=1,n=1;intx;x=(m=a>b)&&(n=c>d);printf("x=%d",x);printf("m=%d,n=%d",m,n);getch();}【源程序4】if语句语法1结构用法示例。#includemain(){inta,b;scanf("%d%d",&a,&b);if(a

5、f("%d",a);elseprintf("%d",b);getch();}【源程序5】if语句语法2结构用法示例。#includemain(){charch;scanf("%c",&ch);if(ch>='a'&&ch<='z')ch-='a'-'A';printf("%c",ch);getch();}【源程序6】if语句嵌套结构用法示例。#includemain(){charc;scanf("%c",&c);if(c<32)printf("Thisis

6、acontrolcharacter.");elseif(c>='0'&&c<='9')printf("Thisifadigit.");elseif(c>='A'&&c<='Z')printf("Thisisacapitalletter.");elseif(c>='a'&&c<='z')printf("Thisisasmallletter.");elseprintf("Thisisanothercharater.");getch();}【源程序7】else和if的匹配问题示例。#inc

7、ludemain(){floatx,y;scanf("%f",&x);if(x<0)y=-1;elseif(x==0)y=0;elsey=1;printf("x=%f,y=%2.0f",x,y);getch();}