Use your knowledge learned from class to provide an evaluation of the constructs
ID: 674307 • Letter: U
Question
Use your knowledge learned from class to provide an evaluation of the constructs (union and switch) in the following C programs:
1)
int main() {
union {
int i;
char *s;
} x;
x.i = 10;
printf(x.s);
}
2)
int main () {
int index, odd, even;
scanf(“%d”, &index);
odd = 0;
even = 0;
switch (index) {
case 1:
case 3: odd += 1;
case 2:
case 4: even += 1;
default:
printf(“index=%d, odd=%d, even=%d ”, index, odd, even);
}
}
Explanation / Answer
Union :
Union is a user defined structure which is given the size of variable which have maximum storage capacity.
In above case it would be integer.
Switch:
Switch case is used for making the decision based on the value of one variable.
In above case it is index variable.
if the index variable value is 1 or 3 then odd count will be incremented if index variable value is 2 or 4 then even count will be incremented else the value of index variable odd varaible and even variable will be printed.
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