PRIME1 Compilation Error?

[Mc_MoSa_sof]

#include <iostream>
#include <cmath>
using namespace std;
bool IsPrime(int);
int main() {
	int t, m, n;
	cin >> t;
    if(t <= 10) {
	for(int k=0; k<=t; k++) {

		string sline;
		getline(cin, sline);

		m = atoi(sline.substr(0, sline.find(" ")).c_str());
		n = atoi(sline.substr(sline.find(" ") + 1, sline.size()).c_str());
		if(1 <= m && m <= n && n <= 1000000000 && n-m<=100000) {
			for(int i=m; i<=n; i++) {
				if(i == 0 || i == 1) {
					continue;
				}
				if(IsPrime(i)) {
					cout << i << endl;
				}
			}
		}
	}
}
return 0;
}
bool IsPrime(int x) {
    for(int i = (int)sqrt(x); i>=2; i--) {

	if(x % i == 0) {
		return false;
	}

}
return true;
}

What's Wrong With This Code ?? It Gives Me Compilation Error

I'm Using Eclipse Indigo

[white_snake]

Just use scanf.

[Mc_MoSa_sof]

Thank You For Replying

Actually I'm still a beginner so i have no idea about the scanf function, so i'll read about it

but i just want to know what's wrong with this code, i mean, it works just fine on eclipse but it gives me error here that all

[leppyr64]

I have no idea what eclipse is but it's probably not using the gcc compiler. If you read the compiler error it will tell you what the error is. In this case atoi is not declared. It exists in the cstdlib so you need to include it.

It will likely be easier for you to use scanf as was suggested. See the sticky that is posted in the c\c++ forum.

[Mc_MoSa_sof]

Thank You But i've already tried to include this library and even included a bunch of libraries and it gives me "time limit exceeded"
i think i'll have to read about "scanf"

and btw eclipse is using the gcc compiler

[leppyr64]

Time Limit Exceeded (TLE around here) is a totally different thing than Compilation Error. The operational complexity (big Oh) of your algorithm is too large to solve this problem within the timelimit.

[Mc_MoSa_sof]

Oh, well i think i'll have to solve the problem using a simpler algorithm
it would take more time for a beginner, but i'll give it a try.

thank you