/************************************************************************** 
 * class-bomb.c
 * 
 * 11/19/08: 
 *  Original bomb-lab can be found at http://csapp.cs.cmu.edu/public/labs.html.
 *  Their bomb-lab can only be used in our course if we adopt their book.
 *  This class-bomb is inspired by the original bomb-lab but was mostly
 *  written by Michelle Strout.  The phrasing of the bomb was borrowed.
 ***************************************************************************/

#include <stdio.h>
#include <stdlib.h>

void phase_1();
void phase_2();
void phase_3();
void phase_4();
void phase_5();
void phase_6();

void explode_bomb();


int main(int argc, char *argv[])
{

    printf("Welcome to my fiendish little bomb. You have 6 phases with\n");
    printf("which to blow yourself up. Have a nice day!\n");

    // understanding if statements
    phase_1();
    printf("\nPhase 1 defused. How about the next one?\n");

    // understanding while and do while loops
    phase_2();
    printf("\nThat's number 2.  Keep going!\n");

    // understanding for loops
    phase_3();
    printf("\nHalfway there!\n");

    // understanding pointers and arrays
    phase_4();
    printf("\nSo you got that one.  Try this one.\n");

    // understanding data structures in C
    phase_5();
    printf("\nGood work!  On to the next...\n");

    // understanding C I/O
    phase_6();
    printf("\nBomb defused!!!\n");
    
    return 0;
}

// understanding if statements
void phase_1() 
{
    int a=3, b, c;
          
    // example 1, show LC3 and MIPS assembly in class
    if (a > 0) {
        b = 7;    
    }

    // example 2
    if (b < c) {
        explode_bomb("phase_1 example 2");
    }
    
    // example 3
    if (a = -3) {
        explode_bomb("phase_1 example 3");
    }

    // example 4
    a = 21;
    if (a < 21)
        a = 40;
        explode_bomb("phase_1 example 4");
        
        
    // example 5, show LC3 and MIPS assembly in class
    b = -1;
    if (b > 0) {
        a = 3;
    } else {
        a = 4;
    }

    // example 6
    c = 3;
    if (c == 3)
        if (c < 3)
            b = 3;
        
    else 
        explode_bomb("phase_1 example 6");
    
    a = 3;
}

// understanding while and do while loops
void phase_2() 
{
    int a=3, b=2, c=1;

    // example 1, show LC3 and MIPS assembly in class
    while (a > 0) {
        printf("%d", a);
        a--;
    }
    
    printf("\n");
    
    // example 2, show LC3 and MIPS assembly in class
    a = -1;
    do {
        printf("%d", a);
        a--;
    } while (a > 0);
    
    
    // example 3
    b = -3; c = 0;
    while ( b < 0 ) {
        c+=100;
        if (c < 0) {
            explode_bomb("phase_2 example 3");
        }
    }
 

    printf("\n");
    // example 4,  show LC3 and MIPS assembly in class
    b = -4; c = 0;
    while ( b < 0 ) {
        c ++ ;
        printf("c = %d\n", c);
        if (c > 15) {
            break;
        }
    }
}

// understanding for loops
void phase_3()
{
    int a=1, b=2, c=3;

    // example 1, show LC3 and MIPS assembly in class
    for (a=0; a<4; a++) {
        printf("a = %d\n", a);
    }
    
    
    // example 2
    for (b=0; b<=5; b++, a-=2) {
        b = a;
        if (b < 0) {
            explode_bomb("phase_3 example 2");
        }
    }
}

// understanding pointers and arrays
void phase_4() 
{
}

// understanding data structures in C
void phase_5() 
{
}

// understanding C I/O
void phase_6() 
{
}

void explode_bomb(char * mesg)
{
    printf("\nBOOM!!!\nThe bomb has blown up in %s.\n", mesg);
    exit(1);
}