字符串未在范围内声明

问题描述

#include <iostream>
#include <string>
#include <algorithm>

void convert(String str)
{
    string s1;
    for (int i = 0; i < s1.size(); i++) {
        if (s1[i] >= 'a' && s1[i] <= 'z')
            s1[i] -= 32;
    }
}

using namespace std;
int main()
{

    string str;
    getline(cin,str);
    cout << str << endl;

    convert(str);
    cout << str << endl;
}

输出：

 variable or field 'convert' declared void|
 'String' was not declared in this scope|***

||=== Build file: "no target" in "no project" (compiler: unknown) ===|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp|5|error: variable or field 'convert' declared void|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp|5|error: 'string' was not declared in this scope|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp|5|note: suggested alternative:|
C:\Program Files\CodeBlocks\MinGW\lib\gcc\x86_64-w64-mingw32\8.1.0\include\c++\bits\stringfwd.h|74|note:   'std::__cxx11::string'|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp||In function 'int main()':|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp|26|error: 'convert' was not declared in this scope|
C:\Users\tee\Desktop\cpp_practise\strings\challenge1.cpp|26|note: suggested alternative: '_osver'|
||=== Build failed: 3 error(s),0 warning(s) (0 minute(s),0 second(s)) ===|

解决方法

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