Some stdlib.h function prototypes

• double atof(const char *nptr) -- converts the string nptr to a double
• int atoi(const char *nptr) -- converts the string nptr to an int
• long atol(const char *nptr) -- converts the string nptr to a long
• int rand() -- returns a pseudo random number in the range 0..RAND_MAX inclusive.
• void srand(unsigned int seed) -- uses the argument seed to start a pseudo random number sequence
• int abs(int j) -- absolute value of j
• long labs(long j) -- absolute value of j