功能C++的參數太少

Question

#include <iostream> 
#include <iomanip> 
#include <cstdlib> 

// function prototypes 
void intOutput(); 
void floatingPointOutput(); 
void intMathOperations(int rows, int b, int width); 
void writeHeaderLine(int width); 
void writeMathLine(int a, int b, int width); 

using namespace std; 

int main() 
{ 
cout << "\nProject 1: Math and Functions"; 
cout << "\n"; 
cout << "\n"; 
cout << "\nProject 1 Start."; 
cout << "\nZack Cunningham"; 
cout << "\n"; 
cout << "\nInteger Output Demo:"; 
cout << "\n"; 

intOutput(); 
floatingPointOutput(); 
intMathOperations(); 
writeHeaderLine(); 
writeMathLine(); 

cout << "\n"; 
cout << "\nProject 1 End."; 
cout << "\n"; 

const int FIELD_WIDTH = 10; 
intMathOperations(12, 5, FIELD_WIDTH); 

return EXIT_SUCCESS; 
} 

void intMathOperations(int rows, int b, int width){ 
cout << "\n"; 
cout << "\nInteger Math Operations Demo:"; 
cout << "\n"; 
writeHeaderLine(width); 
cout << "\n"; 
for (int a = 0; a < rows; ++a){writeMathLine(a, b, width); 
} 
} 


void writeHeaderLine(int width){ 
cout << "\n"; 
cout << setw(width) << "a"; 
cout << setw(width) << "b"; 
cout << setw(width) << "a * b"; 
cout << setw(width) << "a/b"; 
cout << setw(width)<< "a % b"; 
} 

void writeMathLine(int width){ 
int a; 
cout << setw(width) << a; 
int b; 
int rows; 
for (int a = 0; a < rows; ++a){writeMathLine(a, b, width); 
} 
} 

void floatingPointOutput(){ 
double a = 2000; 
double b = 3; 
double c = a/b; 
cout << "\n" << a << "/" << b << " = "; 
cout << "\n" << c; 

cout << setprecision(10); 
cout << "\n" << setw(20) << c; 
cout << scientific; // scientific notation 
cout << "\n" << setw(20) << c; 
cout << fixed; // standard decimal notation 
cout << "\n" << setw(20)<< c; 
cout << left; // left justify 
cout << "\n" << setw(20) << c; 
cout << right; 

// right justify (default) 
cout << "\n" << setw(20) << c; 
cout << setprecision(6); // return to default 
cout << "\n" << setw(20) << c; 
cout << "\n"; 
} 

// function calls 
void intOutput(){ 
cout << "\nInteger Output Demo:"; 
cout << "\n"; 
int a = 12; 
int b = 12345678; 
cout << "\n....5...10...15...20"; // spacing info 
cout << "\n"; 
cout << "\n" << setw(20) << a; 
cout << "\n" << setw(20) << b; 
cout << "\n"; 
cout << "\n" << setw(4) << a; 
cout << "\n" << setw(4) << b; 
cout << left; // left justified 
cout << "\n"; 
cout << "\n" << setw(20) << a; 
cout << "\n" << setw(20) << b; 
cout << right; // right (default) justified 
cout << "\n"; 
} 

這是我的代碼，當然，它給了我3個錯誤，說我的最後3個函數的參數太少。任何幫助將不勝感激！對我來說，看起來所有參數都是有效的，但我只是一個初學者。

Answer 1

在這裏，您聲明需要三個參數的函數：

void intMathOperations(int rows, int b, int width); 

在這裏，你不帶任何參數都叫它：

intMathOperations(); 

編譯器告訴你，這是不正確。與writeHeaderLine和writeMathLine相同。

Answer 2

要調用這些功能，而無需PARAMS

void intMathOperations(int rows, int b, int width); 
void writeHeaderLine(int width); 
void writeMathLine(int a, int b, int width);