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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
I did not get answers here
same here