goto!

goto.c

#include <stdio.h>

int main() {
    void *instructions[5];

    int ip = 0;
    int n = 0;
    int a, b;

    a = 10;
    b = 20;
    
    instructions[0] = &&add;
    instructions[1] = &&add;
    instructions[2] = &&add;
    instructions[3] = &&mul;
    instructions[4] = &&hlt;
    goto* instructions[ip++];

    add:
        a = a + b;
        printf("add a = %d, b = %d\n", a, b);
        goto* instructions[ip++];
    
    sub:
        a = a - b;
        printf("sub a = %d, b = %d\n", a, b);
        goto* instructions[ip++];
    
    mul:
        a = a * b;
        printf("mul a = %d, b = %d\n", a, b);
        goto* instructions[ip++];
    
    div:
        a = a / b;
        printf("div a = %d, b = %d\n", a, b);
        goto* instructions[ip++];
    
    hlt:
        goto finish;

    finish:
        printf("a = %d, b = %d", a, b);
}