Its way of passing arguments to a function.In this method the value of actual arguments(the arguments in the function call)remains unchanged. changes that we make are effected only to the formal arguments.
eg.
#include
main()
{
int a,b;
printf("enter two numbers");
scanf("%d %d",&a,&b);
modify(a,b);// function call the parameters a and b are actual arguments.
printf(" a and b in the main %d and %d",a,b);
}
void modify(int a,int b)// function header the parameters no1 and no2 are called as formal arguments.
{
a=a*3;
b=b*3;
printf(" a and b in function %d and %d",a,b
}
output:enter two numbers3
2
a and b in function 9 and 6
a and b in the main 3 and 2.
this is a program to multiply 3 to the numbers given by the user . here we use function and the arguments are passed by call by value method.here the value of the formal arguments are altered withinthe function but no change happens to the actual arguments . the values in the main does change even after the function call.
The only method of parameter-passing. If you want to emulate call-by-reference in C, you have to use pointers.
Example:
int main (int argc, char **argv)
{
printf ("argc=%d argv[0]=%s\n", argc, argv[0]);
return 0;
}
statement should not return a value but function returns a value
use the _itoa function
im not 100% sure, but i think it is c++.
When we call a function in C++ by passing the values as arguments, it is called call by value. e.g #include<iostream.h> #include<conio.h> int add(int,int); int main() { int a,b,c; cout<<"Enter numbers."; cin>>a>>b; c=add(a,b); cout<<"Sum : "<<c; return 0; } int add(int a,int b) { int c; c=a+b; return c; }
2L is the literal constant for a long (int) type with the value 2.
Nothing, c--3 is syntactical error.
C++
Because you can use programming structures, namely: sequence, selection (if, switch) and repetition (while, for, do-while)
im not 100% sure, but i think it is c++.
statement should not return a value but function returns a value
use the _itoa function
It's a part of the program's data, which has a name,type and value.
Very easily: there is no call-by-reference in C.
Yes.
When we call a function in C++ by passing the values as arguments, it is called call by value. e.g #include<iostream.h> #include<conio.h> int add(int,int); int main() { int a,b,c; cout<<"Enter numbers."; cin>>a>>b; c=add(a,b); cout<<"Sum : "<<c; return 0; } int add(int a,int b) { int c; c=a+b; return c; }
different between defining value definition section and defining value declaration section
C and C++ are both high-level programming languages.