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getpid() checking of code

onetwo123 (74)
I need to get pid for every processes. In process I get sum of every arrays. In the I get max sum.
I wrote programm but I have doubt. Can you check it?

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#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <sys/wait.h>
#include <algorithm>

int main(){
   int arr1[99];
   for(int i=0; i<99; i++) arr1[i] = 0+rand()%10;

   int arr2[99];
   for(int i=0; i<199; i++) arr2[i] = 0+rand()%20;

   int arr3[99];
   for(int i=0; i<99; i++) arr3[i] = 0+rand()%30;

   int arr4[99];
   for(int i=0; i<99; i++) arr4[i] = 0+rand()%40;

   int arr5[99];
   for(int i=0; i<99; i++) arr5[i] = 0+rand()%50;

//process 1
   pid_t pid1;
   pid1=fork();
   if (pid1<0){
      std::cout << "Cannot create child process. Exit!!!" << std::endl;
      exit(1);
   }
   if (pid1==0){
std::cout << "This is child process. My pid 1 = " << getpid() << std::endl;
      int sum1 = 0;
      for (int i = 0; i < 100; i++) sum1 += arr1[i];
      std::cout << "sum 1 = " << sum1 << std::endl;
      exit(0);
   }
      std::cout<< "This is parent process. Pid child process 1 " << pid1 << std::endl;
      int sum1 = 0;
      for (int i = 0; i < 100; i++) sum1 += arr1[i];
      std::cout << "sum 1 = " << sum1 << std::endl;
      wait(0);

//process 2
   pid_t pid2;
   pid2=fork();
   if (pid2<0){
      std::cout << "Cannot create child process. Exit!!!" << std::endl;
      exit(1);
   }
   if (pid2==0){
       std::cout << "This is child process. My pid 2 = " << getpid() << std::endl;
       int sum2 = 0;
       for (int i = 0; i < 100; i++) sum2 += arr2[i];
       std::cout << "sum 2 = " << sum2 << std::endl;
       exit(0);
   }
       std::cout<< "\nThis is parent process. Pid child process 2 = " << pid2 << std::endl;
       int sum2 = 0;
       for (int i = 0; i < 100; i++) sum2 += arr2[i];
 std::cout << "sum 2 = " << sum2 << std::endl;
       wait(0);

//process 3
   pid_t pid3;
   pid3=fork();
   if (pid3<0){
      std::cout << "Cannot create child process. Exit!!!" << std::endl;
      exit(1);
   }
   if (pid3==0){
       std::cout << "This is child process. My pid 3 = " << getpid() << std::endl;
       int sum3 = 0;
       for (int i = 0; i < 100; i++) sum3 += arr3[i];
       std::cout << "sum 3 = " << sum3 << std::endl;
       exit(0);
   }
       std::cout<< "\nThis is parent process. Pid child process 3 " << pid3 << std::endl;
       int sum3 = 0;
       for (int i = 0; i < 100; i++) sum3 += arr3[i];
       std::cout << "sum 3 = " << sum3 << std::endl;
       wait(0);

//process 4
   pid_t pid4;
   pid4=fork();
   if (pid4<0){
      std::cout << "Cannot create child process. Exit!!!" << std::endl;
 exit(1);
   }
   if (pid4==0){
       std::cout << "This is child process. My pid 4 = " << getpid() << std::endl;
       int sum4 = 0;
       for (int i = 0; i < 100; i++) sum4 += arr4[i];
       std::cout << "sum 4 = " << sum4 << std::endl;
       exit(0);
   }
       std::cout<< "\nThis is parent process. Pid child process 4 " << pid4 << std::endl;
       int sum4 = 0;
       for (int i = 0; i < 100; i++) sum4 += arr4[i];
       std::cout << "sum 4 = " << sum4 << std::endl;
       wait(0);

//process 5
   pid_t pid5;
   pid5=fork();
   if (pid5<0){
      std::cout << "Cannot create child process. Exit!!!" << std::endl;
      exit(1);
   }
   if (pid5==0){
       std::cout << "This is child process. My pid 5 = " << getpid() << std::endl;
       int sum5 = 0;
       for (int i = 0; i < 100; i++) sum5 += arr5[i];
       std::cout << "sum 5 = " << sum5 << std::endl;
       exit(0);
   }
       std::cout<< "\nThis is parent process. Pid child process 5 " << pid5 << std::endl;
       int sum5 = 0;
for (int i = 0; i < 100; i++) sum5 += arr5[i];
       std::cout << "sum 5 = " << sum5 << std::endl;
       wait(0);

   std::cout << "\nMax value = " << std::max({sum1, sum2, sum3, sum4, sum5}) << std::endl;

   return 0;

};


Result:

This is parent process. Pid child process 1 5051
sum 1 = 464
This is child process. My pid 1 = 5051
sum 1 = 464

This is child process. My pid 2 = 5052
sum 2 = 978
This is parent process. Pid child process 2 = 5052
sum 2 = 978

This is parent process. Pid child process 3 5053
This is child process. My pid 3 = 5053
sum 3 = 1275
sum 3 = 1275

This is parent process. Pid child process 4 5054
sum 4 = 1762
This is child process. My pid 4 = 5054
sum 4 = 1762

This is parent process. Pid child process 5 5055
sum 5 = 2767
This is child process. My pid 5 = 5055
sum 5 = 2767

Max value = 2767
Last edited on
salem c (3685)
We did this already, and the code looks no different to last time.
https://www.cplusplus.com/forum/general/277406/

You didn't even manage to fix the array overrun problems.
> int arr1[99];
...
> for (int i = 0; i < 100; i++) sum1 += arr1[i];
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