Data types in C language

• Always data types will decides that what type of data need to be hold in a variable.
• in ‘c’ programming language, there are 3 type of basic data types are available i.e int,float, char.
• In implementation whenever the predefined data type is not supporting . User requirement then extend size and range of predefined data types i.e primitive data types are required
• In ‘c’ programming language, there are ‘9’ types of predefined or primitive data types are available , those are

• The basic advantage of classifying this many types nothing but utilizing the memory more efficiently and increasing the performance.
• In implementation, when we require character operators then recommended to go for unsigned cap data type.
• In implementation, when we require the numeric values from the range of -128 to 128 then go for char data type in place of constructing an integer, in this case, we require to use %d format specifier
• When we require the numeric values from the range of 0 to 255 then go for unsigned char data type in place of constructing unsigned integer, in this case we require to use %u format specifier.
• For normal numeric operation, go for an int type, if there is no any negative representations are available like Employee salary then recommended to go for unsigned int type.
• Signed , unsigned, short and long are called “Qualifiors”
• signed, unsigned indicates sign specifications
• short & long indicates size specifications.
• This all qualifiers we require to use for an integer data type only. i.e we can’t use for float, double and long double.
• By default , any type of integral variable type sign is signed type, size is short type.

• void main()

{ int i; long int l; float f; i=32767+1; l=32767+1; f=32767+1; printf(“%d%ld  %f”,i,l,f); } o/p: 32768                   -32768       -32768.000000    

Arithmetic operations on data types:-

int , int     int int, char      int signed int, unsigned int      signed int signed , unsigned -    signed int, long int      long int int,float      float float, long int      float float, double    double double, long double      long double.

• if both arguments are same type then return value is same, if both arguments are different then among those two, bigger one will be the return value.
• When we are working with an integral values with the combination of float, then return value is float type only.

• void main()

{ int i, long int l; float f; i=32767+1; l=32767l+1;                  // l=(long int) 32767+1; f=32767.0f+1;              // f=(float)32767+1; printf(“%d      %ld    %f  ”,i,l,f); } o/p : -32768       32768        32768.000000