#include<iostream>
#include<cstdlib>
#include<cstring>
using namespace std;
void mutual(char* val)
{
    unsigned int x;
    char l_s;
    double a_s,c_s;
    x=unsigned int strlen(const char* val);
    l_s=*(val+x-1);
    a_s=double atof(*(val+x-2));
    if(l_s=='C'||l_s=='c')cout<<"Degrees Fahrenheit"<<a_s*9/5+32<<"F"<<endl;
    else if(l_s=='F'||l_s=='f')cout<<"Degrees Celsius"<<5/9*(a_s-32)<<"C"<<endl;
    else cout<<"Please enter the correct temperature."<<endl;
}
int main()
{
    char value;
    cout<<"Please enter the fahrenheit or celsius.Remember plus unit."<<endl;
    cin.get(value);
    mutual(&value);
    return 0;
}

--------------------Configuration: text3 - Win32 Debug--------------------
Compiling...
text3.cpp
F:\VC Class\3rd\text3.cpp(10) : error C2062: type 'unsigned int' unexpected
F:\VC Class\3rd\text3.cpp(12) : error C2062: type 'double' unexpected
Error executing cl.exe.

text3.exe - 2 error(s), 0 warning(s)

[此贴子已经被作者于2016-7-14 09:35编辑过]

括起来了，然后提示了这个
--------------------Configuration: text3 - Win32 Debug--------------------
Compiling...
text3.cpp
F:\VC Class\3rd\text3.cpp(10) : error C2143: syntax error : missing ')' before 'const'
F:\VC Class\3rd\text3.cpp(10) : error C2660: 'strlen' : function does not take 0 parameters
F:\VC Class\3rd\text3.cpp(10) : error C2059: syntax error : ')'
F:\VC Class\3rd\text3.cpp(12) : error C2664: 'atof' : cannot convert parameter 1 from 'char' to 'const char *'
        Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

text3.exe - 4 error(s), 0 warning(s)