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#include <iostream>
#include <string>
 
struct obj
{
	char name[20];
	int age;
	std::string addr;
 
};
 
 
 
int main(int argc, char* argv[])
{
	obj person {char(argv[1]), atoi(argv[2]), char(argv[3]) };
	std::cout << person.age << " " << person.name << " " << person.addr << std::endl;
    return 0;
}

prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:16:26: error: cast from ‘char*’ to ‘char’ loses precision [-fpermissive]
  obj person {char(argv[1]), atoi(argv[2]), char(argv[3]) };
                          ^
prog.cpp:16:56: error: cast from ‘char*’ to ‘char’ loses precision [-fpermissive]
  obj person {char(argv[1]), atoi(argv[2]), char(argv[3]) };
                                                        ^
prog.cpp:16:33: warning: narrowing conversion of ‘atoi(((const char*)(*(argv + 16u))))’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]
  obj person {char(argv[1]), atoi(argv[2]), char(argv[3]) };
                             ~~~~^~~~~~~~~

Standard output is empty