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Redeclaration of global variable in C
Here we will see what is re-declaration of global variables in C. Does C supports this or not. Let us see the following code to get the idea about it.
Example
#include <stdio.h>
int main(){
int a;
int a = 50;
printf("a is : %d\n", a);
}Output
[Error] redeclaration of 'a' with no linkage
So we can see that we cannot re-declare local variables. Now let us see what will be the output for global variables.
Example
#include <stdio.h>
int a;
int a = 50;
int main(){
printf("a is : %d\n", a);
}Output
a is : 50
So global variables are not creating any error in this case. Now let us see if the first declaration is holding one value, then it can be re-declared or not?
Example
#include <stdio.h>
int a = 10;
int a = 50;
int main(){
printf("a is : %d\n", a);
}Output
[Error] redefinition of 'a'
So we can see that we can only re-declare global variables, when they are not initialized.
Updated on: 30-Jul-2019
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