C does not support Methods inside structure.

Reason :

╔═[■]═══════════════════════
║#include <stdio.h>
║#include <conio.h>
║
║struct temp
║{
║  int a;
║  get_data()
║  {

      printf("Enter value of a : ");
║    scanf("%d",&a);
║  }
║}T;
║
║void main()
║{
║   T.get_data();
║}

saved  file as ".c" file
Error : Function May not be part of structure of Union
and same code will run if you save file as ".cpp"