constants Questions and Answers
constants
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30 questions
1. What will be the output of the program?
#include<stdio.h>
int main()
{
int y=128;
const int x=y;
printf("%d\n", x);
return 0;
}
- 128
- Garbage value
- Error
- 0
2. What will be the output of the program?
#include<stdio.h>
#include<stdlib.h>
union employee
{
char name[15];
int age;
float salary;
};
const union employee e1;
int main()
{
strcpy(e1.name, "K");
printf("%s %d %f", e1.name, e1.age, e1.salary);
return 0;
}
- Error: RValue required
- Error: cannot convert from 'const int *' to 'int *const'
- Error: LValue required in strcpy
- No error
3. What will be the output of the program?
#include<stdio.h>
int fun(int **ptr);
int main()
{
int i=10;
const int *ptr = &i;
fun(&ptr);
return 0;
}
int fun(int **ptr)
{
int j = 223;
int *temp = &j;
printf("Before changing ptr = %5x\n", *ptr);
const *ptr = temp;
printf("After changing ptr = %5x\n", *ptr);
return 0;
}
- Address of i Address of j
- 10 223
- Error: cannot convert parameter 1 from 'const int **' to 'int **'
- Garbage value
4. What will be the output of the program?
#include<stdio.h>
int main()
{
const int x=5;
const int *ptrx;
ptrx = &x;
*ptrx = 10;
printf("%d\n", x);
return 0;
}
- 5
- 10
- Error
- Garbage value
5. What will be the output of the program in TurboC?
#include<stdio.h>
int fun(int **ptr);
int main()
{
int i=10, j=20;
const int *ptr = &i;
printf(" i = %5X", ptr);
printf(" ptr = %d", *ptr);
ptr = &j;
printf(" j = %5X", ptr);
printf(" ptr = %d", *ptr);
return 0;
}
- i= FFE2 ptr=12 j=FFE4 ptr=24
- i= FFE4 ptr=10 j=FFE2 ptr=20
- i= FFE0 ptr=20 j=FFE1 ptr=30
- Garbage value
6. What will be the output of the program?
#include<stdio.h>
int main()
{
const char *s = "";
char str[] = "Hello";
s = str;
while(*s)
printf("%c", *s++);
return 0;
}
- Error
- H
- Hello
- Hel
7. What will be the output of the program?
#include<stdio.h>
int get();
int main()
{
const int x = get();
printf("%d", x);
return 0;
}
int get()
{
return 20;
}
- Garbage value
- Error
- 20
- 0
8. What will be the output of the program (in Turbo C)?
#include<stdio.h>
int fun(int *f)
{
*f = 10;
return 0;
}
int main()
{
const int arr[5] = {1, 2, 3, 4, 5};
printf("Before modification arr[3] = %d", arr[3]);
fun(&arr[3]);
printf("\nAfter modification arr[3] = %d", arr[3]);
return 0;
}
- Before modification arr[3] = 4 After modification arr[3] = 10
- Error: cannot convert parameter 1 from const int * to int *
- Error: Invalid parameter
- Before modification arr[3] = 4
9. What will be the output of the program?
#include<stdio.h>
int main()
{
const int i=0;
printf("%d\n", i++);
return 0;
}
- 10
- 11
- No output
- Error: ++needs a value
10. What will be the output of the program?
#include<stdio.h>
int main()
{
const c = -11;
const int d = 34;
printf("%d, %d\n", c, d);
return 0;
}
- Error
- -11, 34
- 11, 34
- None of these