running time between linux-script and C++ on linux

Dear Experts,

Linux script is more or less like interpreted scrip as javascript but working for different platform such as one is for browsers and other is for  linux system script, Right ? Is linux-script  based on Assembly , C or C++ language  ?
I tried one benchmark code speed testing for "fop loop"  with linux  "time" command ,
The execution time of the C++ program is  around 0.01 seconds(11 ms) but for the linux script,
the time is  34 seconds that is totally greater than C++.

Do you have idea to explain the different result ? Or the time difference is depended on
some linux system  differnt setting on using  memory for script and binary program  ?
 And attached just simple example code  for "for loop" program with iteration of 2e6

Please advise

Rwniceing

Bash shell for loop with 2e6;

#!/bin/bash
for ((i=1;i<=200000000;i++))
do
a="$[1234+$5678+$i]"
b="$[1234*5678+$i]"
c="$[1234/2+$i]"
done

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C++ for loop with 2e6

int main(){
int max = 2e6;
int a,b,c;
	// CODE YOU WANT TO TIME
	int start = getMilliCount();
	for (int i = 0; i < max; i++) {
    a = 1234 + 5678 + i;
    b = 1234 * 5678 + i;
	c=1234/2+i;
   }
return 0;
}

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