Question

//***********************************************************

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

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

using namespace std;

int main()
{
int a, b, width, rows;

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(rows, b, width); // int math demonstration
writeHeaderLine(width);
writeMathLine(a, b, width);

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 a, int b, int width){
cout << setw(width) << a;
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";
}

这是我的程序的所有代码，我已经完成了整个过程。最后没有错误，但它只是一个无限循环运行的空白程序。我不确定该怎么做，如果有人可以提供帮助，我会很感激。感谢。

Answer 1

至少你需要解决这个问题。您将变量rows定义为

int a, b, width, rows;

但是你没有初始化rows而你在这里使用它，

intMathOperations(rows, b, width); // int math demonstration

在rows循环中使用for作为结束条件。这是一个问题。

要解决此问题，我建议你打开所有类似的警告

g++ -Wall your_code.cpp

并确保您了解所有警告并修复必要的警告。

程序运行时的空白窗口？

1 个答案: