error: conversion from ‘int’ to ‘char’ may change value [-Werror=conversion]

build cmd example: g -std=c 11 test.cpp -o a.out -Werror=conversion

    auto index = 3;
    char singleChar = 'A'   index; // I want to get A-Z

I hope sigleChar is dynamically assigned. could you pls help me to solve this error report without using switch? How would it be better to write code?

CodePudding user response：

'A' index; // I want to get A-Z would only works for ASCII, not EBCDIC for example.

A more portable solution (and not int to char conversion involved) is array indexing:

char singleChar = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[index];

CodePudding user response：

You have to typecast it to a char:

auto index = 3;
char singleChar {static_cast<char>('A'   index)};