CODEWITHSUNDEEP
c++
adi
adi

Reputation: 43

Convert a character to an integer in C++ language

I want to convert from char to integer, following is the code-

FILE *p;
char temp;
int temp_int;
p=fopen("week3data","r");    
temp=getc(p);
temp_int=atoi(temp)

number in file goes from 1 to 200, need some guidance.

Upvotes: 1

Views: 87

Answers (2)

Dante's Dream
Dante's Dream

Reputation: 37

If you're reading from a file, you shouldnt be using 

temp=getc(p);

and if you use 

temp=fgetc(p);

and the number is, for example 200, you will only read the "2".

so the answer is:

better use

char * buffer; 
fgets(buffer,10, p);
temp_int=atoi(buffer);

Upvotes: 0

vincentp
vincentp

Reputation: 1433

If you're using C++, please use C++ SL:

std::fstream stream("file.txt", std::ios_base::in);
float number;
stream >> number;
std::cout << number;

Edit: Don't forget to check if your stream is valid:

if (!stream) {
  throw std::runtime_error("Cannot open file");
}

Upvotes: 1

Related Questions