C programming. Please explain. I will rate like.

1 2 3 4 // Fig. 3.13: fig03_13.c // Preincrementing and postincrementing. #include 6 8 5 // function main begins program execution int main( void) 7 { int c; // define variable 9 10 // demonstrate postincrement c = 5; // assign 5 toc printf("%d ", c); // print 5 13 printf("%d ", C++ ); // print 5 then postincrement 14 printf("%d ", c); // print 6 Fig. 3.13 Preincrementing and postincrementing (Part 1 of 2.) 12 94 Chapter 3 Structured Program Development in C 15 16 // demonstrate preincrement 17 C = 5; // assign 5 toc 18 printf("%d ", ); // print 5 19 printf("%d ", ++c); // preincrement then print 6 20 printf("%d ", c); // print 6 21 } // end function main 5 6 Fig. 3.13 | Preincrementing and postincrementing. (Part 2 of 2.) Figure 3.13 a. What is the role ofint cin the program? b. What is the role of c=3 to the program