#include <stdio.h> #include <setjmp.h> //jmp_buf：数组，保存栈信息即运行环境 jmp_buf buf; double Divide(double a, double b) { if (b == 0.0) { longjmp(buf, 1); // throw } else return a / b; } //setjmp保存当前栈信息，成功返回0，当执行到longjmp时， //恢复栈信息即跳转到setjmp位置重新执行setjmp //且此次返回值根据longjmp函数参数给定 int main(void) { int ret; ret = setjmp(buf); if (ret == 0) // try { printf("division ... "); printf("%f ", Divide(5.0, 0.0)); } else if (ret == 1) // catch { printf("divisiong by zero "); } return 0; }
运行结果：
division ...
divisiong by zero
其实上次错误处理模式已经是c++异常处理雏形
上述相当于：
#include <iostream> using namespace std; double Divide(double a, double b) { if (b == 0.0) { throw 1; // throw } else return a / b; } int main(void) { try // try { cout<<"division ..."<<endl; cout<<Divide(3.0, 0.0)<<endl; cout<<Divide(5.0, 0.0)<<endl; } catch (int) // catch { cout<<"divisiong by zero"<<endl; } return 0; }
运行结果同上