c - Implicit declaration of functions warning -


i'm trying use functions isdigit() have correct include statement, #include <ctype.h> however, seem getting warning when compile, 

warning: implicit declaration of function 'isdigit' invalid in c99 [-wimplicit-function-declaration]

the line compiles warning if(isdigit(atoi(inputline)) { can give me feedback missing here? thanks.

the name of function isdigit(), not isdigit(). c case-sensitive.


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