Have the written this one program & unsure of how to reverse it so that it will have a sum check for the reciever & then sum check for sender and compare the 2 sum that will return zero.

Please help.Code:/* Demonstrate the calculation of a checksum using one's complement arithmetic. Written by: Date: */ #include <stdio.h> #include <string.h> #include <pstdint.h> int main (void) { // Local Declarations uint32_t sum = 0x00000000; uint16_t checksum = 0x0000; char* str = "ABCDEFGHI"; int len; int i = 0; // Statements len = strlen (str); if (len % 2 == 1) // Make the number of characters even len++; for (i = 0; i < len; i += 2) sum = (sum + str[i] * 256 + str[i + 1]); // Add carries into lower 16 bits while (sum >> 16) sum = (sum & 0xffff) + (sum >> 16); // Complement checksum = ~sum; printf ("str: %s\n", str); printf ("checksum: %#06X\n", checksum); system("Pause"); return 0; } // main /* Results: str: ABCDEFGHI checksum: 0XA5EA

thank you.