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If a name that has not been described before appears in an expression and
is followed by the left parenthesis, it will be contextually considered
as the name of a function.
もし、事前に記載されていない名前で式が現れ、その後に丸括弧が続いていれは、その文脈は関数の名前として見なされます。
function_name (x1, x2,..., xn)
Arguments ( formal parameters) are passed by value, i.e., each expression xl, . . . , xn is calculated,
and the value is passed to the function. The order of expressions calculation
and that of values loading are guaranteed. During the execution, the system
checks the number and type of arguments given to the function. Such way
of addressing to the function is called a value call. Function call is
an expression thy value of which is the value returned by the function.
The function type described above must correspond with the type of the
returned value. The function can be declared or described in any part of
the program on the global scope, i.e., outside other functions. The function
cannot be declared or described inside of another function.
Examples:
例：
int start()
{
double some_array[4]={0.3, 1.4, 2.5, 3.6};
double a=linfunc(some_array, 10.5, 8);
//...
}
double linfunc(double x[], double a, double b)
{
return (a*x[0] + b);
}
At calling of a function with default parameters, the list of parameters
to be passed can be limited, but not before the first default parameter.
規定のパラメータを持つ関数を呼び出すことにおいて、渡されるパラメータの一覧を限定することができます。しかし、最初の規定パラメータの前ではできません。
Examples:
例：
| void somefunc(double init,double sec=0.0001,int level=10); |
// |
function prototype 関数原型 |
| somefunc(); |
// |
wrong call, the first required parameter must be presented. 間違った呼び出し、最初の必須パラメータを提示しなければなりません。 |
| somefunc(3.14); |
// |
proper call 適切な呼び出し |
| somefunc(3.14, 0.0002); |
// |
proper call 適切な呼び出し |
| somefunc(3.14, 0.0002, 10); |
// |
proper call 適切な呼び出し |
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When calling a function, one may not skip parameters, even those having default values:
関数を呼び出すとき、規定値を持っていたしても、１つのパラメータも省略してはいけません。
| somefunc(3.14, , 10); |
// |
wrong call. the second parameter was skipped. 間違った呼び出し。２番目のパラメータはスキップされました。 |
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