Programming Essentials in C: Chapter 5 Assignment (CLA) Exam Answers

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1. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        char s[10] = "ABCDE", *p = s + 3; 

        printf("%d", p[1] - p[-1]); 
        return 0; 
    }

the program outputs 1
the program outputs 4
the program outputs 2
the program outputs 3

2. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        char s[] = "ABCDE", *p = s + 5; 

        printf("%d", p[-1] - *(p - 4)); 
        return 0; 
    }

the program outputs 3
the program outputs 1
the program outputs 4
the program outputs 2

3. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        char *p = "12345", *q = p - 10; 

        printf("%d", q[14] - q[13]); 
        return 0; 
    }

the program outputs 2
the program outputs 1
the program outputs 3
the program outputs 4

4. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        int t[] = { 1, 2, 3, 4, 5 }, *p = t; 

        *p++; 
        (*p)++; 
        *p++; 
        printf("%d",p[-1]); 
        return 0; 
    }

the program outputs 1
the program outputs 4
the program outputs 2
the program outputs 3

5. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        int t[2][2] = { 1, 2, 4, 8 }; 
        int s = 0, i, j; 

        for(i = 2; i; i -= 2) 
        	for(j = 1; j < 2; j += 2) 
        		s += t[i - 1][j]; 
        printf("%d",s); 
        return 0; 
    }

the program outputs 8
the program outputs 2
the program outputs 1
the program outputs 4

6. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        int t[1][2][2] = { { { 1, 2 }, { 3, 4 } } }; 
        int s = 0, i, j, k; 

        for(i = 1; i > 0; i -= 2) 
        	for(j = 1; j < 2; j += 2) 
        		for(k = 0; k < 3; k += 3) 
        		s += t[k][i - 1][j]; 
        printf("%d",s); 
        return 0; 
    }

the program outputs 2
the program outputs 3
the program outputs 4
the program outputs 1

7. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    int main(void) { 
        int *p = (int *)malloc(2 * sizeof(int)); 
        *p = 2; 
        *(p + 1) = *(p) - 1; 
        *p = p[1]; 
        printf("%d",*p); 
        free(p); 
        return 0; 
    }

the program outputs 3
the program outputs 1
the program outputs 2
the program outputs 4

8. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    int main(void) { 
        int t[] = { 8, 4, 2, 1 }; 
        int *p = (int *)malloc(sizeof(t)); 
        int i; 
        for(i = 0; i < 4; i++) 
        	p[3 - i] = t[i]; 
        printf("%d",*(p + 2)); 
        free(p); 
        return 0; 
    }

the program outputs 3
the program outputs 1
the program outputs 2
the program outputs 4

9. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    int main(void) { 
        int i,j; 
        int **p = (int **)malloc(2 * sizeof(int *)); 
        p[0] = (int *)malloc(2 * sizeof(int)); 
        p[1] = p[0]; 
        for(i = 0; i < 2; i++) 
        	for(j = 0; j < 2; j++) 
        		p[i][j] = i + j; 
        printf("%d",p[0][0]); 
        return 0; 
    }

the program outputs 1
the program outputs 4
the program outputs 2
the program outputs 3

10. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    int main(void) { 
        int i,j; 
        int **p = (int **)malloc(2 * sizeof(int *)); 
        p[0] = (int *)malloc(2 * sizeof(int)); 
        p[1] = (int *)malloc(2 * sizeof(int)); 
        for(i = 0; i < 2; i++) 
        	for(j = 0; j < 2; j++) 
        		p[i][j] = i + j; 
        printf("%d",p[0][0]); 
        return 0; 
    }

the program outputs 0
the program outputs 2
the program outputs 3
the program outputs 1

11. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        int *t[10]; 
        int (*u)[10]; 
        printf("%d",sizeof(t) != sizeof(u)); 
        return 0; 
    }

the program outputs 0
the program outputs 4
the program outputs 1
the program outputs 16

12. What happens if you try to compile and run this program?

    #include <stdio.h> 
    int main(void) { 
        int *(t[10]); 
        int *u[10]; 
        printf("%d",sizeof(t) != sizeof(u)); 
        return 0; 
    }

the program outputs 3
the program outputs 0
the program outputs 1
the program outputs 2

13. What happens if you try to compile and run this program?

    #include <stdio.h> 
    struct S { 
        int S; 
    }; 
    int main(void) { 
        struct S S; 
        S.S = sizeof(struct S) / sizeof(S); 
        printf("%d",S.S); 
        return 0; 
    }

the program outputs 3
the program outputs 1
the program outputs 4
the program outputs 2

14. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <string.h> 
    struct Q { 
        char S[3]; 
    }; 
    struct S { 
        struct Q Q; 
    }; 
    int main(void) { 
        struct S S = { '\0', '\0','\0' }; 
        S.Q.S[0] = 'A'; 
        S.Q.S[1] = 'B'; 
        printf("%d",strlen(S.Q.S)); 
        return 0; 
    }

the program outputs 4
the program outputs 1
the program outputs 2
the program outputs 3

15. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <string.h> 
    struct Q { 
        char S[3]; 
    }; 
    struct S { 
        struct Q Q; 
    }; 
    int main(void) { 
        struct S S = { '\0', '\0','\0' }; 
        S.Q.S[0] = 'A'; 
        S.Q.S[2] = 'B'; 
        printf("%d",strlen(S.Q.S)); 
        return 0; 
    }

the program outputs 3
the program outputs 4
the program outputs 2
the program outputs 1

16. What happens if you try to compile and run this program?

    #include <stdio.h> 
    struct Q { 
        int a,b,c; 
    }; 
    struct S { 
        int a,b,c; 
        struct Q Q; 
    }; 
    int main(void) { 
        struct Q Q = { 3,2,1 }; 
        struct S S = { 4,5,6 }; 
        S.Q = Q; 
        printf("%d",S.b - S.Q.b); 
        return 0; 
    }

the program outputs 1
the program outputs 4
the program outputs 2
the program outputs 3

17. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    struct S { 
        int 	  a; 
        struct S *b; 
    }; 
    int main(void) { 
        struct S *x = (struct S*) malloc(sizeof(struct S)); 
        struct S *y = (struct S*) malloc(sizeof(struct S)); 
        x->a = 2; 
        x->b = y; 
        y->a = 4; 
        y->b = x; 
        printf("%d",x->b->b->b->a); 
        free(x); free(y);
        return 0; 
    }

the program outputs 1
the program outputs 4
the program outputs 3
the program outputs 2

18. What happens if you try to compile and run this program?

    #include <stdio.h> 
    #include <stdlib.h> 
    struct S { 
        int 	  a; 
        struct S *b; 
    }; 
    int main(void) { 
        struct S *x = (struct S*) malloc(sizeof(struct S)); 
        struct S *y = (struct S*) malloc(sizeof(struct S)); 
        struct S *p; 
        x->a = 2; x->b = y; 
        y->a = 4; y->b = x; 
        p = x; 
        p = p->b->b->b->b; 
        printf("%d",p->a); 
        return 0; 
    }

the program outputs 2
the program outputs 4
the program outputs 3
the program outputs 1

19. What happens if you try to compile and run this program?

    #include <stdio.h> 
    struct S { 
        int a[2]; 
    }; 
    int main(void) { 
        struct S S[2]; 
        int i; 
        for(i = 0; i < 2; i++) 
        	S[i].a[1-i] = 4 * !i; 
        printf("%d",S[0].a[1]); 
        return 0; 
    }

the program outputs 2
the program outputs 4
the program outputs 1
the program outputs 3

20. What happens if you try to compile and run this program?

    #include <stdio.h> 
    struct S { 
        char *p; 
    }; 
    int main(void) { 
        char *p = "abcd"; 
        struct S S[2]; 
        int i; 
        for(i = 0; i < 2; i++) 
        	S[i].p = p + i; 
        printf("%c",S[1].p[0]); 
        return 0; 
    }

the program outputs a
the program outputs d
the program outputs b
the program outputs c