在这个部分，我们将看到C语言中的setjump和longjump是什么。setjump()和longjump()位于setjmp.h库中。这两个函数的语法如下所示。
setjump(jmp_buf buf) : uses buf to store current position and returns 0. longjump(jmp_buf buf, i) : Go back to place pointed by buf and return i.
These are used in C for exception handling. The setjump() can be used as try block, and longjump() can be used as throw statement. The longjump() transfers control the pointe which is pointed by setjump().
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Here we will see how to print a number 100 times without using recursion, loop, or macro expansion. Here we will use the setjump() and longjump() functions to do that.
Example
#include#include jmp_buf buf; main() { int x = 1; setjmp(buf); //set the jump position using buf printf("5"); // Prints a number x++; if (x <= 100) longjmp(buf, 1); // Jump to the point located by setjmp }
输出
5555555555555555555555555555555555555555555555555555555555555555555555555555 555555555555555555555555
