Expressions Questions

• In C expression evaluation, consider the statement: a = f1(23, 14) * f2(12/4) + f3(); What is the guaranteed order in which the three function calls f1, f2, and f3 are executed?
• Unary operators in C language: from the list 1) ! 2) sizeof 3) ~ 4) &&, which subset consists only of unary operators?
• C operator precedence and associativity: determine the evaluation order by operator for z = x + y * z / 4 % 2 - 1 (from highest to lowest, left-to-right where applicable).
• Hierarchy of arithmetic operations in C: which option correctly places the higher-precedence operators before the lower-precedence ones?
• Across the following operator categories in C—(1) Relational, (2) Arithmetic, (3) Logical, (4) Assignment—what is the correct precedence order from highest to lowest?
• Conditional operator usage in C: which of the following is a correct and idiomatic use of the ternary operator ?:
• In C, evaluate logical expressions and operator precedence. What is the output of the following program? #include int main() { int i=4, j=-1, k=0, w, x, y, z; w = i || j || k; x = i && j && k; y = i || j && k; z = i && j || k; printf("%d, %d, %d, %d ", w, x, y, z); return 0; }
• C conditional (?:) with character ranges: what does this program print? #include int main() { char ch; ch = 'A'; printf("The letter is"); printf("%c", ch >= 'A' && ch <= 'Z' ? ch + 'a' - 'A' : ch); printf("Now the letter is"); printf("%c ", ch >= 'A' && ch <= 'Z' ? ch : ch + 'a' - 'A'); return 0; }
• C logical OR (||) evaluation: what does this program output? #include int main() { int x=12, y=7, z; z = x!=4 || y == 2; printf("z=%d ", z); return 0; }
• C short-circuiting with pre-increment side effects: what does this program print? #include int main() { int i=-3, j=2, k=0, m; m = ++i && ++j || ++k; printf("%d, %d, %d, %d ", i, j, k, m); return 0; }
• C comma operator in an expression: determine the output. #include int main() { int i=2; int j = i + (1, 2, 3, 4, 5); printf("%d ", j); return 0; }
• In C programming, what will be the output of the following program (note the nested conditional operator and that only 'num' is printed)? #include int main() { int k, num = 30; k = (num > 5 ? (num <= 10 ? 100 : 200) : 500); printf("%d ", num); return 0; }
• In C, evaluate short-circuit and precedence: what is the output? #include int main() { int i = -3, j = 2, k = 0, m; m = ++i || ++j && ++k; printf("%d, %d, %d, %d ", i, j, k, m); return 0; }
• In C, static storage and default initialization: what is printed? #include int main() { static int a[20]; int i = 0; a[i] = i; printf("%d, %d, %d ", a[0], a[1], i); return 0; }
• Assuming int is 2 bytes, what is printed by this C program (two’s complement typical behavior)? #include int main() { printf("%x ", -2 << 2); return 0; }
• In C, trace pre-decrement and post-decrement results: what is the output? #include int main() { int x = 4, y, z; y = --x; z = x--; printf("%d, %d, %d ", x, y, z); return 0; }
• In C, what is the output when assigning with post-increment on the same variable? #include int main() { int i = 3; i = i++; printf("%d ", i); return 0; }
• In C, evaluate expressions in printf arguments left to right: what prints? #include int main() { int x = 55; printf("%d, %d, %d ", x <= 55, x = 40, x >= 10); return 0; }
• In C, logical OR produces an integer result: what does this program print? #include int main() { int a = 100, b = 200, c; c = (a == 100 || b > 200); printf("c=%d ", c); return 0; }
• In C, evaluate logical AND chain with pre-increments: what is the output? #include int main() { int i = -3, j = 2, k = 0, m; m = ++i && ++j && ++k; printf("%d, %d, %d, %d ", i, j, k, m); return 0; }