This section contains find output programs on C language Structures; each question has correct output and explanation about the answer.
Predict the output of following programs.
1) Is the following declaration of structure 'tag' is correct?
int main()
{
struct tag{
int a;
float b;
};
//other statement
return 0;
}
2) Is the following declaration of structure 'tag' is correct?
int main()
{
struct tag{
int a=0;
float b=0.0f;
};
//other statement
return 0;
}
3) What will be the output of following program?
#include <stdio.h>
int main()
{
struct tag{
int a;
float b;
};
struct tag t={10,10.23f};
printf("%d, %.02f\n",t.a,t.b);
return 0;
}
4) Is the following structure variable declaration is correct? If yes, what will be the output of following program?
#include <stdio.h>
int main()
{
struct person{
char *name;
int age;
};
struct person p={"Mani",21};
printf("%s, %d\n",p.name,p.age);
return 0;
}
5) What will be the output of this program?
#include <stdio.h>
int main()
{
struct person{
char name[30];
int age;
};
struct person p={"Mani",21};
//edit values
p.name="Vanka";
p.age=27;
printf("%s, %d\n",p.name,p.age);
return 0;
}
C programming
Answer 1:
Explanation
Yes, structure tag is declared in the main() block and it is allowed in C language, the scope of tag will be local and we can access tag inside main() only.
Answer 2:
Explanation
No, we cannot initialize any member of the structure with in its declaration.
Answer 3:
Output
Explanation
Structure members can be initialized while declaring its object (structure variable) like struct tag t={10,10.23f};
Answer 4:
Output
Explanation
Yes, the structure variable declaration is correct, we can initialize string value like this (consider the statement struct person p={"Mani",21};).
Answer 5:
Output
Explanation
String cannot be assigned directly (p.name="Vanka";), we can use strcpy or memcpy to copy the string.
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