Increment and Decrement Operators Quiz Online Practice Test

1. How do the two following code snippets differ?
#include <stdio.h>
int main() {
int d, a = 1, b = 2;
d = a++ + ++b;
printf("%d %d %d", d, a, b);
}
#include <stdio.h>
int main() {
int d, a = 1, b = 2;
d = a++ +++b;
printf("%d %d %d", d, a, b);
}

2. What is the output of this C code?
#include <stdio.h>
int main() {
int a = 1, b = 1, c;
c = a++ + b;
printf("%d, %d", a, b);
}

3. What result will the following C code produce?
#include <stdio.h>
int main() {
int a = 1, b = 1, d = 1;
printf("%d, %d, %d", ++a + ++a + a++, a++ + ++b, ++d + d++ + a++);
}

4. In which case will the code `PI++;` cause an error?

5. What will the following C code output?
#include <stdio.h>
int main() {
int a = 10, b = 10;
if (a = 5)
b--;
printf("%d, %d", a, b--);
}

6. What is the output of the following C code?
#include <stdio.h>
int main() {
int i = 0;
int j = i++ + i;
printf("%d\n", j);
}

7. What does the following C code output?
#include <stdio.h>
int main() {
int i = 2;
int j = ++i + i;
printf("%d\n", j);
}

8. What can be said about the behavior of the following C code?
#include <stdio.h>
int main() {
int i = 2;
i = i++ + i;
printf("%d\n", i);
}

9. What is the output of the following C code?
#include <stdio.h>
int main() {
int i = 0;
int x = i++, y = ++i;
printf("%d %d\n", x, y);
return 0;
}

10. What is the output of the following C code?
#include <stdio.h>
int main() {
int i = 10;
int *p = &i;
printf("%d\n", *p++);
}

11. What output will this C code produce?
#include <stdio.h>
void main() {
int x = 97;
int y = sizeof(x++);
printf("X is %d", x);
}

12. What will be displayed by this C code?
#include <stdio.h>
void main() {
int x = 4, y, z;
y = --x;
z = x--;
printf("%d%d%d", x, y, z);
}

13. What is the result of running this C code?
#include <stdio.h>
void main() {
int x = 4;
int *p = &x;
int *k = p++;
int r = p - k;
printf("%d", r);
}

14. What does this C code output?
#include <stdio.h>
void main() {
int a = 5, b = -7, c = 0, d;
d = ++a && ++b || ++c;
printf("\n%d%d%d%d", a, b, c, d);
}

15. What is the result of executing this C code?
#include <stdio.h>
void main() {
int a = -5;
int k = (a++, ++a);
printf("%d\n", k);
}