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/*Author:Choas Lee
*Date:2012-02-28
*/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
float add(float a,float b){return a+b;}
float minus(float a,float b){return a-b;}
float multiply(float a,float b){return a*b;}
float divide(float a,float b){return a/b;}
//该函数的返回值是一个函数
float(* FunctionMap(char op) )(float,float)
{
switch(op)
{
case ‘+‘:
return add;
break;
case ‘-‘:
return minus;
break;
case ‘*‘:
return multiply;
break;
case ‘\\‘:
return divide;
break;
default:
exit(1);
}
}
int main()
{
float a=10,b=5;
char ops[]={‘+‘,‘-‘,‘*‘,‘\\‘};
int len=strlen(ops);
int i=0;
float (*returned_function_pointer)(float,float);//定义了一个函数指针
for(i=0;i<len;i++)
{
returned_function_pointer=FunctionMap(ops[i]);
printf("the result caculated by the operator %c is %f\n",ops[i],returned_function_pointer(a,b));
}
return 0;
}
输出：
the result caculated by the operator + is 15.000000 the result caculated by the operator - is 5.000000 the result caculated by the operator * is 50.000000 the result caculated by the operator \ is 2.000000
参考：
1.http://hipercomer.blog.51cto.com/4415661/792301
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原文地址：http://my.oschina.net/itfanr/blog/361125
