c语言switch结构多次用,C语言及程序设计初步例程-25 用switch语句实现多分支结构...

贺老师教学链接  C语言及程序设计初步 本课讲解

例：这是星期几?

#include int main()

{

int week;

scanf("%d", &week);

switch(week)

{

case 0:

printf("Sundayn");

case 1:

printf("Mondayn");

case 2:

printf("tuesdayn");

case 3:

printf("wednesdayn");

case 4:

printf("Thursdayn");

case 5:

printf("Fridayn");

case 6:

printf("Saturdayn");

default :

printf("errorn");

}

return 0;

}

必要时，用break及时退出

#include int main()

{

int week;

scanf("%d", &week);

switch(week)

{

case 0:

printf("Sundayn"); break;

case 1:

printf("Mondayn"); break;

case 2:

printf("tuesdayn"); break;

case 3:

printf("wednesdayn"); break;

case 4:

printf("Thursdayn"); break;

case 5:

printf("Fridayn"); break;

case 6:

printf("Saturdayn"); break;

default :

printf("errorn");

}

return 0;

}

多个case可以共用一组执行语句

#include int main()

{

int week;

scanf("%d", &week);

switch(week)

{

case 1:

case 2:

case 3:

case 4:

case 5:

printf("Workdayn"); break;

case 0:

case 6:

printf("Weekendn"); break;

default :

printf("errorn");

}

return 0;

}

简单的四则“运算器”

#include int main()

{

float a,b;

char c;

printf("Please enter a,b and op:");

scanf("%f%c%f",&a,&c,&b);

switch(c)

{

case '+':

printf("%f+%f=%fn",a,b,a+b);

break;

case '-':

printf("%f-%f=%fn",a,b,a-b);

break;

case '*':

printf("%f*%f=%fn",a,b,a*b);

break;

case '/':

if(b!=0.0) /*分母不能等于0*/

printf("%f/%f=%fn",a,b,a/b);

else

printf("error!n");

break;

default:

printf("error!n");

break;

}

return 0;

}