strlen
strcasecmp
tolower
strcat
strncpy
strcmp
strcpy
strchr
vsprintf
memcpy
memset
rand
atoi
atof
abs
floor
fabs
tan
atan
sqrt
log
cos
sin
atan2
strlen
strcasecmp
tolower
strcat
strncpy
strcmp
strcpy
strchr
vsprintf
memcpy
memset
rand
atoi
atof
abs
floor
fabs
tan
atan
sqrt
log
cos
sin
atan2