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void AugMatrix::helperFunc(std::string &strnum){
	std::string tryagain;
	int bad = 0;
	int watchout = 0;
	int strsize = strnum.size();
 
	for (int i = 0; i < strsize; i++){
		if (!(((48 <= strnum[i]) && (strnum[i] <= 57)) || (strnum[i] == 46))){
			bad = 1;
			break;
		}
		if (strnum[i] == 46){
			watchout++;
			if (watchout == 2){
				break;
			}
		}
	}
 
	if ((bad == 1) || (2 == watchout)){
		std::cout << "Invalid input; please enter numbers. Try again: ";
		std::cin >> tryagain;
		helperFunc(tryagain);
		strnum = tryagain;
	}
	return;
}

prog.cpp:1:6: error: 'AugMatrix' has not been declared
 void AugMatrix::helperFunc(std::string &strnum){
      ^
prog.cpp:1:33: error: variable or field 'helperFunc' declared void
 void AugMatrix::helperFunc(std::string &strnum){
                                 ^
prog.cpp:1:28: error: 'string' is not a member of 'std'
 void AugMatrix::helperFunc(std::string &strnum){
                            ^
prog.cpp:1:41: error: 'strnum' was not declared in this scope
 void AugMatrix::helperFunc(std::string &strnum){
                                         ^

Standard output is empty