#1 Računanje obima kruga uz pomoć konstante Pi

#include <stdio.h>
#include <conio.h>

#define PI 3.145

        main(){
              
        int r=5; //cm
        float obim;
        obim=2*r*PI;
        printf("obim=%f cm",obim);      
          getch();    
              
        }

#1 Hello World u C programskom jeziku

#include <stdio.h>
#include <conio.h>

void main(){

    printf("Hello World \n");
    getch();


}