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c++codeblockscompiler-warningstype-narrowing

How to enable narrowing warnings in CodeBlocks?

I'm writing c++ program using codeblocks IDE

int main()
{
int i =0;
int f = 3.14;
i = f; //must give me a warning message, possible loss data.
}

Why the compilation not show a narrowing warning message? How to enable that?

Note: I have fixed my compiler options as -std=c++11 -Wall

Solution

  • in the other compiler options put -Wconversion

    ( code::block 16 )

    enter image description here

    for: 

    int i =0;
int f = 3.14;
i = f;

    warning: conversion to ‘int’ alters ‘double’ constant value [-Wfloat-conversion]

    Some useful warning that I use always:

    enter image description here

    -Wall -Weffc++ -Wextra -pedantic -Wfatal-errors -pedantic-errors