Write a C++ program sums consecutive integer numbers. 1+2+3+...+n, use do/while loop? .....

C++

This is  C programming. Please fill in the blank. Code is to copy string and print backward. /* Requirement: We’ll initialize a string (I’ll use “Hello World”). Then, create a second string and copy the first string over, but backwards, using a loop. Print both strings. For example: string 1 is “Hello World”, string 2 would be “dlroW olleH”.  */ /*Copy Strings Backward Input String1: Hello World*/ #include<stdio.h> #define str_len __1__ //str_len = hello + space + world + null char LEN __2__ print_string(__3__ str[__4__]); __5__ copy_string(__6__ s1[__7__], __8__ s2[__9__]); int main() { __10__ str1[]= "Hello World"; __11__ str2[__12__]; //loop and copy each character over // until the array reaches null character copy_string(__13__, __14__); //printing back by calling function print_string printf("String1: "); print_string(__15__); printf("\nString2: "); print_string(__16__); } /* Copy one string to another by looping backward. Need 2 index variables to keep track of each…