C Language Catch exception

The day of Leisure read LUA source code, found that the original C language except Goto another way to handle the exception. Both Setjump longjump two functions, setjump equivalent to try,longjump equivalent to a catch. Unlike Goto, Longjump is global and has a broader scope than Goto. Here's a simple usage:

#include <stdlib.h>

#include <setjmp.h>

Jmp_buf jumper;

int fdf (int A, int b) {

if (b = = 0)

{ //can ' t divide by 0

longjmp(jumper,-3); Skip to the jmp point where jumper is located , and3 corresponds to the specific exception code.

}

return A/ B;

}

int Main (int argc, char **argv)

{

int jstatus = setjmp(jumper); equivalent to java catch, if a jumper exception occurs, it jumps back to this jmp Point

if (jstatus = = 0) {//First time execution is correct setjmp return 0.

int a = 1;

int B = 0;

printf("%d/%d", A, b);

int result = fdf(A, b);

printf("=%d\n", result);

}

Else if (jstatus = =-3)

printf("--Error:divide by zero\n");

Else

printf("Unhandled Error case");

}

C Language Catch exception