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问题描述
我有一个程序在这里我反转输入字符串的大小写。这是我的.cpp文件中的代码,我使用Visual Studio C ++ IDE。我不知道我需要一个头文件或者如果我需要一个,使这项工作。
I have a program here where I invert the case of an entered string. This is the code in my .cpp file and I am using Visual Studio C++ IDE. I am not sure what I need in a header file or if I need one to make this work.
错误与我的函数调用swapCase。由于某些原因,我不知道主要没有看到swapCase。
Error with my function call swapCase. Main does not see swapCase for some reason that I'm not sure of.
#include <cctype> #include <iostream> #include <conio.h> using namespace std; int main() { char name[30]; cout<<"Enter a name: "; cin.getline(name, 30); swapCase(name); cout<<"Changed case is: "<< name <<endl; _getch(); return 0; } void swapCase (char* name) { for(int i=0;name[i];i++) { if ( name[i] >= 'A' && name[i] <= 'Z' ) name[i] += 32; //changing upper to lower else if( name[i] >= 'a' && name[i] <= 'z') name[i] -= 32; //changing lower to upper } }或语义。
推荐答案在main函数之前添加此行:
Add this line before main function:
void swapCase (char* name); int main() { ... swapCase(name); // swapCase prototype should be known at this point ... }这被称为前向声明:当编译函数调用时,编译器需要知道函数原型。
This is called forward declaration: compiler needs to know function prototype when function call is compiled.
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在函数调用时找不到标识符错误
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