Pointers for the Hands-on (Third) Exam

Please familiarize yourself with the following functions as you will use them on your exam:

atoi()

Syntax:

#include 
int atoi( const char *str );

Description:
The atoi() function converts str into an integer, and returns that integer. str should start with some sort of number, and atoi() will stop reading from str as soon as a non-numerical character has been read.

Example:

i = atoi( "512.035" );

RESULT: i set to 512.

atof()

Syntax:

#include 
double atof( const char *str );

Description:
The function atof() converts str into a double, then returns that value. str must start with a valid number, but can be terminated with any non-numerical character, other than "E" or "e".

Example:

x = atof( "42.0is_the_answer" );

RESULT: x set to 42.0

Source: http://www.elook.org/programming/c/atof.html


No need to learn complicated matrix operations like those involve in finding solutions to linear equations. You just have to know the Basic Matrix and Row operations.

Good luck!