Concept of Programming: Instruction Type in C

Tuesday, September 1, 2015

In C programming language 3 types of instructions are available. These are as follows:-

1. Type declaration Instruction

3. Control Instruction

In C programming language every variable which is used in the program must be declared before its use in any further statements.

So, this instruction is used to declare the type of a variable being used in the program.

For ex.:- If we have to use "a" as a variable typed integer then we should declare it before using it as-

int a;

Note-1 When we declare any variable at that time we are also eligible to initialize this variable.

For ex. int i=5,j=7;

float a=5.5;

Note-2 when we declare and initialize variables together the issue of ordering occurs.

Sometime order of declaration matters and sometime not.

For ex. 1) int i=10,j=25;

int j=25,i=10;

here,order of variable declaration doesn't matter.

2) float a=1.5,b=a+3.1;

float b=a+3.1,a=1.5;

here,the issue of ordering will occur because in second instruction we are using variable 'a' before declaring it.

RELATED TOPIC FROM C PROGRAMMING LANGUAGES :-

Concept of Programming