C Programming :: Declarations and Initializations

Find Output of Program:

6.	What will be the output of the program? #include<stdio.h> int X=40; int main() { int X=20; printf("%d\n", X); return 0; }
	A. 20 B. 40 C. Error D. No Output Answer & Explanation Answer: Option A Explanation: Whenever there is conflict between a local variable and global variable, the local variable gets priority.

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7.	What is the output of the program #include<stdio.h> int main() { int x = 10, y = 20, z = 5, i; i = x < y < z; printf("%d\n", i); return 0; }
	A. 0 B. 1 C. Error D. None of these Answer & Explanation Answer: Option B Explanation: Since x < y turns to be TRUE it is replaced by 1. Then 1 < z is compared and to be TRUE. The 1 is assigned to i.

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8.	What is the output of the program #include<stdio.h> int main() { extern int fun(float); int a; a = fun(3.14); printf("%d\n", a); return 0; } int fun(int aa) { return (int)++aa; }
	A. 3 B. 3.14 C. 0  D. 4 E. Compile Error Answer & Explanation Answer: Option E Explanation: 2 Errors 1. Type mismatch in redeclaration of fun 2. Type mismatch in parameter aa

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9.	What is the output of the program #include<stdio.h> int main() { int a[5] = {2, 3}; printf("%d, %d, %d\n", a[2], a[3], a[4]); return 0; }
	A. Garbage Values B. 2, 3, 3 C. 3, 2, 2 D. 0, 0, 0 Answer & Explanation Answer: Option D Explanation: When an automatic array is partially initialized, the remaining elements are initialized to 0.

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10.	What is the output of the program? #include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u; u.ch[0] = 3; u.ch[1] = 2; printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); return 0; }
	A. 3, 2, 515 B. 515, 2, 3 C. 3, 2, 5 D. None of these Answer & Explanation Answer: Option A Explanation: printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); It prints the value of u.ch[0] = 3, u.ch[1] = 2 and it prints the value of u.i means the value of entire union size. So the output is 3, 2, 515.

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In the following program how long will the for loop get executed? #include<stdio.h> int main() { int i=5; for(;scanf("%s", &i); printf("%d\n", i)); return 0; }

A. The for loop would not get executed at all B. The for loop would get executed only once C. The for loop would get executed 5 times D. The for loop would get executed infinite times Answer & Explanation Answer: Option D Explanation: During the for loop execution scanf() ask input and then printf() prints that given input. This process will be continued repeatedly because, scanf() returns the number of input given, the condition is always true(user gives a input means it reurns '1'). Hence this for loop would get executed infinite times.

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12.	What will be the output of the program? #include<stdio.h> int main() { int X=40; { int X=20; printf("%d ", X); } printf("%d\n", X); return 0; }
	A. 40 40 B. 20 40 C. 20 D. Error Answer & Explanation Answer: Option B Explanation: In case of a conflict between a local variable and global variable, the local variable gets priority.