This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Unions – 2”.
Pre-requisite for C Unions MCQ set: Video Tutorial on C Unions.
1. What will be the output of the following C code?
#include <stdio.h>union{int x;
char y;
}p;
int main()
{p.x = 10;
printf("%d\n", sizeof(p));
}
a) Compile time error
b) sizeof(int) + sizeof(char)
c) Depends on the compiler
d) sizeof(int)
View Answer
Explanation: None.
2. What will be the output of the following C code?
#include <stdio.h>union{int x;
char y;
}p;
int main()
{p.y = 60;
printf("%d\n", sizeof(p));
}
a) Compile time error
b) sizeof(int) + sizeof(char)
c) Depends on the compiler
d) sizeof(char)
View Answer
Explanation: None.
3. What will be the output of the following C code?
#include <stdio.h>union p{int x;
char y;
};
int main()
{union p p, b;
p.y = 60;
b.x = 12;
printf("%d\n", p.y);
}
a) Compile time error
b) Depends on the compiler
c) 60
d) Undefined behaviour
View Answer
Explanation: None.
4. What will be the output of the following C code?
#include <stdio.h>union p{int x;
char y;
}k = {1, 97};
int main()
{printf("%d\n", k.y);
}
a) Compile time error
b) 97
c) a
d) 1
View Answer
Explanation: None.
5. What will be the output of the following C code?
#include <stdio.h>union p{int x;
char y;
}k = {.y = 97};
int main()
{printf("%d\n", k.y);
}
a) Compile time error
b) 97
c) a
d) Depends on the standard
View Answer
Explanation: None.
6. What will be the output of the following C code?
#include <stdio.h>union p{int x;
float y;
};
int main()
{union p p, b;
p.x = 10;
printf("%f\n", p.y);
}
a) Compile time error
b) Implementation dependent
c) 10.000000
d) 0.000000
View Answer
Explanation: None.
7. Which of the following share a similarity in syntax?
1. Union, 2. Structure, 3. Arrays and 4. Pointers
a) 3 and 4
b) 1 and 2
c) 1 and 3
d) 1, 3 and 4
View Answer
Explanation: None.
8. What will be the output of the following C code? (Assuming size of char = 1, int = 4, double = 8)
#include <stdio.h>union utemp{int a;
double b;
char c;
}u;
int main()
{u.c = 'A';
u.a = 1;
printf("%d", sizeof(u));
}
a) 1
b) 4
c) 8
d) 13
View Answer
Explanation: None.
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