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What do you mean by function return in C language?
A function is a self-contained block that carries out a specific task.
The advantages of function in C language are as follows −
Reusability
The length program can be reduced.
It is easy to locate and isolate a wrong function.
It facilitates top-down modular programming.
Example
Following is the C program for functions −
#include<stdio.h>
/*Function prototypes*/
myfunc();
main(){
myfunc();
}
/*Function Defination*/
myfunc(){
printf("Hello
");
}Here,
In calculations, we generally expect a function to return a value. But, it may or may not accept the arguments.
This return value has a type int, float, char or anything else.
Default type of function is integer.
Example
Another program for the function is as follows −
int total (){
int a,b,c;
a=10;
b=20;
c=a+b;
return c; //it returns the c value i.e. prints the result
}Output
When the above program is executed, it produces the following result −
30
Instead of writing two steps,
c=a+b; return c;
We can replace with single-step like return a+b;
If you forget to return a value in a function, it returns the warning message in most of the C compilers. This message warns that you must return a value. Warnings may not stop the program execution but, errors stop it.
Example Program
Given below is the C program for return function −
int main(){
---
---
---
return 0;
}The default return value for an integer type is 0.
If you do not insert return 0 or any other value in your main() function a, 0 will be returned automatically.
If you want to return an int value in your function, it is preferred to mention the return value in your function header.
Returning from a Function
A function returns a single value by means of the return statement.
If the changes are made within the function to the variables, then they are local to that function. A calling function's variables are not affected by the actions of a called function.
The calling function chooses to ignore the value returned by the called function. For example, printf and scanf return values are usually ignored.
The value returned by a function is used in a more complex expression, or it may be assigned to a variable.
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