``````#include <stdio.h>
#include <math.h>

int main()
{
double op1,op2;
char opp;
char *res= "2 ^ 1";

sscanf(res,"%d %c %d",&op1,&opp,&op2);

printf("%d\n",op1);
printf("%c\n",opp);
printf("%d\n",op2);
printf("====\n");
printf("%d\n",pow(op1,op2)); /* the output is for sure 2 */
}``````

but it output :
1073741824 <-- ??? I don't know what here so please any helping will be appreciated thankx

:?:

## All 9 Replies

For doubles, use specifiers for doubles, not ints.

``````sscanf(res,"%lf %c %lf",&op1,&opp,&op2);

printf("%g\n",op1);
printf("%c\n",opp);
printf("%g\n",op2);
printf("====\n");
printf("%g\n",pow(op1,op2)); /* the output is for sure 2 */``````

thankx Dave :p

Davedo you have a simple code that can read a file let's say "xx.txt" line by line? :rolleyes:

Thankx Dave ,but my question is the "%g" means what ?

http://www.rt.com/man/printf.3.html

``````g      The double argument is converted in style  f  or  e
(or  E for G conversions).  The precision specifies
the number of significant digits.  If the precision
is missing, 6 digits are given; if the precision is
zero, it is treated as 1.  Style e is used  if  the
exponent  from  its  conversion  is less than -4 or
greater than or equal to the  precision.   Trailing
zeros  are  removed from the fractional part of the
result; a decimal point appears only if it is  fol-
lowed by at least one digit.``````
``fputs ( line, stdout ); /* write the line */``

I want to save the passed lines into an array
for example:
char *res;

Go with C++ and use a vector of strings. Maybe something similar to this.

``````#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;

int main()
{
static const char filename[] = __FILE__;
ifstream file(filename);
string line;
vector<string> text;
while ( getline(file, line) )
{
text.push_back(line);
}
for ( vector<string>::size_type i = 0, size = text.size(); i < size; ++i )
{
cout << text[i] << endl;
}
return 0;
}``````

Thankx Dave ;)

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