Structure Initialization

[vinayict]

I am unable to understand why I am not able to initialize a global structure variable in the main function, while if I declare a local structure in the main function then I am able to initialize the variable.

#include <stdio.h>
typedef struct abc
{
int a;
int b;
int c;
} s1;

s1 vin;
void main ()
{
vin = {10,20,40};
printf(" The values are a = %d, b= %d, C = %d", vin.a,vin.b,vin .c);

}

Gives a error syntax error before vin = {10,20,30};

While if I declare vin local variable then there is no compilation error and program is running fine.

#include <stdio.h>
typedef struct abc
{
int a;
int b;
int c;
} s1;

void main ()
{
s1 vin = {10,20,40};
printf(" The values are a = %d, b= %d, C = %d", vin.a,vin.b,vin .c);

}
Output :The values are a = 10 , b=20, c=30;

Please help where I am wrong in first program ...

[weaknessforcats]

This syntax:

vin = {10,20,40};

is initialization syntax and only works if the variable is being created. In your case the variable has already been created before main starts. Inside main() you would use the member syntax:

vin.a = 10;
vin.b = 20;
vin.c = 40;