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added few more details about functions. (#19271)

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Added some details about how and where to define functions and spoke about calling a function.
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RujutaKelkar
2018-10-16 10:11:56 +05:30
committed by Quincy Larson
parent 3be33a914b
commit 0ea02af700
1 changed files with 8 additions and 0 deletions
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client/src/pages/guide/english/cplusplus/functions/index.md
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@ -6,6 +6,8 @@ title: Functions in C++
A function is a group of statements that together perform a task. Every C++ program has at least one function, which is `main()`. A function is a group of statements that together perform a task. Every C++ program has at least one function, which is `main()`.
A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function. A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function.
One must always make sure, before using a function in the program, the function is defined.
Even if function definition is after the main, just the function name and its arguments have to be declared above, so that compiler knows what is being talked about.
## The general form of a C++ function definition: ## The general form of a C++ function definition:
@ -43,6 +45,12 @@ int max(int num1, int num2)
return result; return result;
} }
## calling a function:
int res;
res=max(5,10);
// if the function returns a value, assign it to that variable, else just call it like function(arg1,arg2);
``` ```
## Why are functions important? ## Why are functions important?