Question

error C2664: 'convert' : cannot convert parameter 4 from 'int' to 'double &‘ 求高手帮忙

// A program that allows a user to enter a height in inshes and a weight in pounds a returns the height in centimeiters ad the weight in kilograms.

#include <iostream>

#include <cmath>
using namespace std;

void explain_program();
// Tells user what program does

void decimal_format (ostream& os);
// Displays decimal numbers in a "nice" format when displayed in os

void read_inches_pounds (int& height_in_inches, int& weight_in_pounds);
// postcondition: height_in_inches and weight_in_pounds have values
// from user at terminal

void convert (int height_in_inches, int weight_in_pounds,
double& height_in_cms, double& weight_in_kilos);
//precondition: height_in_inches and weight_in_pounds are known positive values
//postcondition: height_in_cms and weight_in_kilos have been caculated

void write_out (ostream& os, double height_in_cms, double weight_in_kilos);
//precondition: height_in_cms and weight_in_kilos have values
//postcondition: These values are written to output stream os

const int SENTINEL = -1;

int main()
{
int height_in_inches, weight_in_pounds;
double height_in_cms, weight_in_kilos;

explain_program(); // Tells user what program does

decimal_format(cout); //display decimal numbers in a "nice" format when displayed

read_inches_pounds (height_in_inches, weight_in_pounds);

while ( height_in_inches != SENTINEL)
{
convert( weight_in_kilos, weight_in_pounds, height_in_cms, height_in_inches)
{
height_in_cms = 1/2.54 * height_in_inches;
weight_in_kilos = 1/0.454 * weight_in_pounds;

read_inches_pounds( height_in_inches, weight_in_pounds);
}
}
}

void convert (int height_in_inches, int weight_in_pounds, double& height_in_cms, double& weight_in_kilos)
{
cout<< "Please enter the height in inches (" << SENTINEL << ")===> ";
cin >>height_in_inches;

if (height_in_inches != SENTINEL)
cout << "Please enter the weight in pounds(" <<SENTINEL << ")===> ";
cin >> weight_in_pounds;
}
void write_out (ostream& os, double height_in_cms, double weight_in_kilos)
{
os<< "\n\nThe height in cms is" << height_in_cms;
os << "\n\nThe weight in kilos is" << weight_in_kilos;
}

error C2664: 'convert' : cannot convert parameter 4 from 'int' to 'double &'
error C2143: syntax error : missing ';' before '{'
对不起 我学的不是中文的 看不太懂你说的 能不能帮我改一下 我自己琢磨琢磨

Answer 1

第一个错误是因为函数:
void convert (int height_in_inches, int weight_in_pounds,
double& height_in_cms, double& weight_in_kilos);
第四个参数是接受double&,而你在调用的时候:
convert( weight_in_kilos, weight_in_pounds, height_in_cms, height_in_inches)
使用的参数height_in_inches是int类型。

而且从逻辑上可以看出你这里调用的参数是错误的，正常调用应该是这样的:
convert(height_in_inches,weight_in_pounds, height_in_cms, weight_in_kilos);

－－－－
第二个错误是，你的convert调用是一个函数调用，不是函数声明、定义所以必须得加一个分号在这一句后边:
convert( weight_in_kilos, weight_in_pounds, height_in_cms, height_in_inches) ;
至于后面的大括号其实是没有必要的。

希望能够帮到你，如果还有什么问题，请留言。