Global variables and local variables with the same name but different types of case analysis?-CodePudding

# include
using namespace std;

Int a=4;
Int main () {
Double a=2.3;
Printf (" % d, % f \ n ", a, a);

system("pause");
return 0;
}

Global variable a is of type int, the local variable a is double,

Based on the principle of the local variable covering global variables, the result should be "2,2.300000",

The actual result is as follows:

The compiler without any warning,

Could you tell me how to analysis everyone a great god this?

CodePudding user response:

 printf (" % d, % lf \ n ", a, a);

Lf type double use % format output,

When global variable names and local variable names, with the same global variable name shielding local variables, namely the global variable is invalid;

CodePudding user response:

Please refer to the type double in memory storage:
https://blog.csdn.net/slience_j/article/details/51965009

CodePudding user response:

The

reference 1/f, confident boy reply:

 printf (" % d, % lf \ n ", a, a); 
Lf type double use % format output,

When global variable names and local variable names, with the same global variable name shielding local variables, namely the global variable is invalid;

Float and double types of output format specifier is % f! Float type is automatically converted to double type, lf and % % f the result is the same,

CodePudding user response:

reference better * man reply: 3/f

Quote: reference 1/f, confident boy reply:

printf (" % d, % lf \ n ", a, a);

Lf type double use % format output,

When global variable names and local variable names, with the same global variable name shielding local variables, namely the global variable is invalid;

Float and double types of output format specifier is % f! Float type is automatically converted to double type, lf and % % f the result is the same,

Depends on the compiler, why don't you try and see if the same,