Programming Forums > Application Development > C++

Mcoy · Nov 13th, 2006, 9:09 PM

string temp;
    char temp2[3];
    int num_of_values;
    
    getline (myfile,temp);
    
    for(int i(0); i < 3; i++)
    {
            temp2[i] = temp[i];
    }
    
    num_of_values = atoi(temp2);

The goal of the above code was to read a line from a file (with the getline function) and convert it from string type to integer type with atoi(). When supplying the atoi function with the string, the compiler gave me an error saying that atoi did not accept strings, only const char*s. So I had to use the for loop that you see in my code to change each letter from the string to a char array. -Seems very redundant to me considering a string is simply a character array, or am I mistaken?
What is a better/more efficient/intuitive way to read integers into my program from a file?

Nov 13th, 2006, 9:09 PM	#1
Mcoy Newbie Join Date: Mar 2006 Posts: 20 Rep Power: 0	About atoi function and const chars... (Toggle Plain Text) string temp; char temp2[3]; int num_of_values; getline (myfile,temp); for(int i(0); i < 3; i++) { temp2[i] = temp[i]; } num_of_values = atoi(temp2); string temp; char temp2[3]; int num_of_values; getline (myfile,temp); for(int i(0); i < 3; i++) { temp2[i] = temp[i]; } num_of_values = atoi(temp2); The goal of the above code was to read a line from a file (with the getline function) and convert it from string type to integer type with atoi(). When supplying the atoi function with the string, the compiler gave me an error saying that atoi did not accept strings, only const char*s. So I had to use the for loop that you see in my code to change each letter from the string to a char array. -Seems very redundant to me considering a string is simply a character array, or am I mistaken? What is a better/more efficient/intuitive way to read integers into my program from a file?

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Programming Forums > Application Development > C++

About atoi function and const chars...