Ways to define a function in C

There are four major types of function definition

• Takes nothing Returns something
• Takes something Returns something
• Takes nothing Returns nothing
• Takes something Returns something

• Takes nothing Returns nothing

 When a function has no arguments, it does not receive any data from the calling function. Similarly when it does not return a value, the calling function does not receive any data from the called function.
Syntax :

Function declaration : void function();
Function call : function();
Function definition :
                      void function()
                      {
                        statements;
                      }

// C code for  function with no //  arguments and no return value    #include <stdio.h> void value(void); void main() {     value(); } void value(void) {     int year = 1, period = 5, amount = 5000, inrate = 0.12;     float sum;     sum = amount;     while (year <= period) {         sum = sum * (1 + inrate);         year = year + 1;     }     printf(" The total amount is %f:", sum); }

Output:

The total amount is 5000.000000