Example:

#include <stdio.h>

int main(){
	
	printf("Hello world\n");
	printf("Line: %d\n",__LINE__);
	printf("How are you?\n");
	printf("Line: %d\n",__LINE__);
	printf("Bye bye!!!\n");
	
	return 0;
}

Output

    Hello world
    Line: 6
    How are you?
    Line: 8
    Bye bye!!!