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int main(){
	string str; //Store a number
    int i=0; //Spit out the number
 
    cout << "Enter a number: ";
    getline(cin, str);
 
    while(true){
        stringstream ss(str);
		for(int i=0; i<str.size(); i++){
			if(str[i]==' '){
				 cout <<"\nPlease enter a valid number: ";
				getline(cin,str);
				i=0;
			}
		}
        if (ss >> i){
            break;
        }
        else{
            cout <<"\nPlease enter a valid number: ";
            getline(cin,str);
        }
    }
 
    cout << "\nThe value stored in string str was: " << i;
    cin.get();
 	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:2: error: ‘string’ was not declared in this scope
prog.cpp:2: error: expected `;' before ‘str’
prog.cpp:5: error: ‘cout’ was not declared in this scope
prog.cpp:6: error: ‘cin’ was not declared in this scope
prog.cpp:6: error: ‘str’ was not declared in this scope
prog.cpp:6: error: ‘getline’ was not declared in this scope
prog.cpp:9: error: ‘stringstream’ was not declared in this scope
prog.cpp:9: error: expected `;' before ‘ss’
prog.cpp:17: error: ‘ss’ was not declared in this scope
prog.cpp:17: warning: name lookup of ‘i’ changed
prog.cpp:3: warning:   matches this ‘i’ under ISO standard rules
prog.cpp:10: warning:   matches this ‘i’ under old rules

Standard output is empty