usage of %d, %f, %c in c programming

 #include<stdio.h>

void main()

{  

   int a = 4;

   float b = 4.5;

   char c = 'p';

   int d  =50;

   int e = 55+85;

   printf("The value of a is %d \n ",a);

   printf("The value of b is %f \n",b); 

   printf("The value of c is %c \n",c);

   printf(" the sum of a and d is %d \n",a+d);

   printf(" The value of e is %d \n",e);

   return 0; 

}