Introduction to Data types
A Data type is nothing but types of data.For example int,char,float,double etc..A variable declared with specific data type(int=a;or float =a;).The type of variable decide how much space is occupied in memory.
All data type is derived by following categories:-
1.Primitive data type or Fundamental Data type.
2.Derived data type.
3.User defined data type.
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| Fig 1:Types of Data Type |
Note: Apart from these basic data type in C language further more data types available which has defined inside header files which we will be discuss asap.
Data Type Range
Basic Data type Range and storage size describe following table:-
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| Fig 1 :Data Type Range |
Program #1
How to find size of data type in C?
#include<stdio.h>
#nclude<conio.h>
void main(void)
{
printf("Size:%d",sizeof(int));
getch();
}
Program #2
#include<stdio.h>
#nclude<float.h>
void main(void)
{
printf("Size:%d byte",sizeof(float));
printf("Float Min_Range:%E \n",FLT_MIN);
printf("Float Max_Range:%E \n",FLT_MAX);
printf("Precision Val:%d \n",FLT_DIG);
getch();
}
Answer:
Size: 4 byte
Float Min_Range: 1.175494E-38
Float Max_Range: 3.402823E+38
Precision Val: 6
Program #3
what is the output?
Assume a variable is declared as signed int a =32767..if you increment a what will be the output?
#include<stdio.h>
void main(void)
{
int a=32767; // default int consider as signed int
a++;
printf("%d",a);
getch();
}
Answer: -32768
Description : In following diagram describe circle diagram of data type range.so when you increment 32767 it will give you -32768 ..see below pic
Signed Integer Range:
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| Fig 1: Signed integer Circle range |
Unsigned Integer Range:
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| Fig 1: Unsigned Integer Circle Range |
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