error when compiling the sqlite documentation code - c++

Question

I copied this code
#include <stdio.h>
#include <stdlib.h>
#include "sqlite3.h"
static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
int i;
for (i = 0; i<argc; i++) {
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int main(int argc, char* argv[]) {
sqlite3 *db;
char *zErrMsg = 0;
int rc;
char *sql;
/* Open database */
rc = sqlite3_open("test.db", &db);
if (rc) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
return(0);
}
else {
fprintf(stdout, "Opened database successfully\n");
}
/* Create SQL statement */
sql = "CREATE TABLE COMPANY(" \
"ID INT PRIMARY KEY NOT NULL," \
"NAME TEXT NOT NULL," \
"AGE INT NOT NULL," \
"ADDRESS CHAR(50)," \
"SALARY REAL );";
/* Execute SQL statement */
rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
if (rc != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
else {
fprintf(stdout, "Table created successfully\n");
}
sqlite3_close(db);
return 0;
}
from official documentation sqlite here: https://www.tutorialspoint.com/sqlite/sqlite_c_cpp.htm
and I got error like this:
Error C2440 '=': cannot convert from 'const char [164]' to 'char *'
I'm using visual studio 2017 and compile file .cpp. I guess something can be wrong with connection between .c and .cpp files, because sqlite is written in .c

Answer 1

The issue is that you are using old C-style variable declaration (all at the beginning) in C++ with the wrong types.
Use this instead:
const char* sql = "CREATE TABLE COMPANY(" \
"ID INT PRIMARY KEY NOT NULL," \
"NAME TEXT NOT NULL," \
"AGE INT NOT NULL," \
"ADDRESS CHAR(50)," \
"SALARY REAL );";
Literal char* are const in C++11.