How can I loop back to start of this simple programme?

[SgtSilock]

I would like to loop back to entering the first number. I am a newbie at C++ and trying to learn : )
Thanks guys

#include<iostream>
using namespace std;
int main()

{



float a,c,ans;
char b;

cout<<"Enter first number."<<endl; 
cin>>a;
cout<<"Enter second number."<<endl;
cin>>c;
cout<<"Enter + for addition"<<endl;
cout<<"Enter - for substraction"<<endl;
cout<<"Enter x for multiplication"<<endl;
cout<<"Enter / for division"<<endl;
cin>>b;

switch (b) {
case '+':
	ans=a+c;
	break;
case '-':
	ans=a-c;
	break;
case 'x':
	ans=a*c;
	break;
case '/':
	ans=a/c;
	break;
default: 
 cout <<"Invalid, plesae try again" <<endl; 
}

cout <<"Answer is:"<< ans << endl;
cout <<"Now try another sum" <<endl;
return 0;
}

[SECMoG1T]

Use a loop tp iterate

char trial;
while (trial==condition)
{
    ///do something
     cout <<"wanna try again?"; cin>> trial;
}

[SgtSilock]

Can you please go into more detail, I have never heard of that

[SECMoG1T]

Okay loops are used to do something repeatedly while a certain condition is met , there are different types of loops, for loop, while loops and do while loops

You can check out here
http://www.cplusplus.com/doc/tutorial/control/