Memory Size Calculator
Medium
C
Variables
36 views
Problem Statement
By printing the size of different datatypes (char, int, float, double, long, pointers). Then create array of each type and verify that array size = element_count * sizeof(type).
Input Format
No user input.
Different C data types and their arrays are created in the program.
Different C data types and their arrays are created in the program.
Output Format
• Size of each data type
• Size of each array
• Verification that
array size = number of elements × sizeof(type)
• Size of each array
• Verification that
array size = number of elements × sizeof(type)
Example
Data types used in C: char, int, float, double, long, pointer
char size = 1 int size = 4 float size = 4 double size = 8 long size = 8 pointer size = 8 char array size = 5 int array size = 20 float array size = 20 double array size = 40
Constraints
• Output depends on system (32-bit / 64-bit)
Concept Explanation
sizeof(type) gives size of one element.
sizeof(array) gives total memory of the array.
sizeof(array) gives total memory of the array.
Step-by-Step Explanation
1.Print sizeof(char), sizeof(int), sizeof(float), sizeof(double), sizeof(long), sizeof(pointer).
2.Create arrays of size 5 for each type.
3.Print sizeof(array).
4.Verify:
• sizeof(array) = number_of_elements × sizeof(type).
2.Create arrays of size 5 for each type.
3.Print sizeof(array).
4.Verify:
• sizeof(array) = number_of_elements × sizeof(type).
Concept Explanation
sizeof(type) gives size of one element.
sizeof(array) gives total memory of the array.
sizeof(array) gives total memory of the array.
Step-by-Step Explanation
1.Print sizeof(char), sizeof(int), sizeof(float), sizeof(double), sizeof(long), sizeof(pointer).
2.Create arrays of size 5 for each type.
3.Print sizeof(array).
4.Verify:
• sizeof(array) = number_of_elements × sizeof(type).
2.Create arrays of size 5 for each type.
3.Print sizeof(array).
4.Verify:
• sizeof(array) = number_of_elements × sizeof(type).
Input / Output Format
Input Format
No user input.
Different C data types and their arrays are created in the program.
Different C data types and their arrays are created in the program.
Output Format
• Size of each data type
• Size of each array
• Verification that
array size = number of elements × sizeof(type)
• Size of each array
• Verification that
array size = number of elements × sizeof(type)
Constraints
• Output depends on system (32-bit / 64-bit)
Examples
Input:
Data types used in C:
char, int, float, double, long, pointer
Output:
char size = 1
int size = 4
float size = 4
double size = 8
long size = 8
pointer size = 8
char array size = 5
int array size = 20
float array size = 20
double array size = 40
Example Solution (Public)
#include <stdio.h>
int main() {
int n = 5;
/* ---- Size of basic data types ---- */
printf("Size of char = %zu bytesn", sizeof(char));
printf("Size of int = %zu bytesn", sizeof(int));
printf("Size of float = %zu bytesn", sizeof(float));
printf("Size of double = %zu bytesn", sizeof(double));
printf("Size of long = %zu bytesn", sizeof(long));
printf("Size of pointer= %zu bytesnn", sizeof(int*));
/* ---- Arrays of each type ---- */
char cArr[5];
int iArr[5];
float fArr[5];
double dArr[5];
long lArr[5];
int *pArr[5]; // array of pointers
/* ---- Verify array size formula ---- */
printf("char array size = %zu (Expected: %zu)n",
sizeof(cArr), n * sizeof(char));
printf("int array size = %zu (Expected: %zu)n",
sizeof(iArr), n * sizeof(int));
printf("float array size = %zu (Expected: %zu)n",
sizeof(fArr), n * sizeof(float));
printf("double array size = %zu (Expected: %zu)n",
sizeof(dArr), n * sizeof(double));
printf("long array size = %zu (Expected: %zu)n",
sizeof(lArr), n * sizeof(long));
printf("pointer array size= %zu (Expected: %zu)n",
sizeof(pArr), n * sizeof(int*));
return 0;
}
Official Solution Code
#include <stdio.h>
int main() {
int n = 5;
/* ---- Size of basic data types ---- */
printf("Size of char = %zu bytesn", sizeof(char));
printf("Size of int = %zu bytesn", sizeof(int));
printf("Size of float = %zu bytesn", sizeof(float));
printf("Size of double = %zu bytesn", sizeof(double));
printf("Size of long = %zu bytesn", sizeof(long));
printf("Size of pointer= %zu bytesnn", sizeof(int*));
/* ---- Arrays of each type ---- */
char cArr[5];
int iArr[5];
float fArr[5];
double dArr[5];
long lArr[5];
int *pArr[5]; // array of pointers
/* ---- Verify array size formula ---- */
printf("char array size = %zu (Expected: %zu)n",
sizeof(cArr), n * sizeof(char));
printf("int array size = %zu (Expected: %zu)n",
sizeof(iArr), n * sizeof(int));
printf("float array size = %zu (Expected: %zu)n",
sizeof(fArr), n * sizeof(float));
printf("double array size = %zu (Expected: %zu)n",
sizeof(dArr), n * sizeof(double));
printf("long array size = %zu (Expected: %zu)n",
sizeof(lArr), n * sizeof(long));
printf("pointer array size= %zu (Expected: %zu)n",
sizeof(pArr), n * sizeof(int*));
return 0;
}
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