defining a function in c
The general form of a function definition in C programming language is as follows:
return_type function_name( parameter list ) { body of the function }
A function definition in C programming language consists of a function header and a function body. Here are all the parts of a function:
- Return Type: A function may return a value. The return_type is the data type of the value the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the keyword void.
- Function Name: This is the actual name of the function. The function name and the parameter list together constitute the function signature.
- Parameters: A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters.
- Function Body: The function body contains a collection of statements that define what the function does.
Example:
Following is the source code for a function called max(). This function takes two parameters num1 and num2 and returns the maximum between the two:
/* function returning the max between two numbers */ int max(int num1, int num2) { /* local variable declaration */ int result; if (num1 > num2) result = num1; else result = num2; return result; }
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