grad.cpp: In function 'int main()': grad.cpp:11: warning: comparison between signed and unsigned integer expressions grad.cpp:16: warning: comparison between signed and unsigned integer expressions grad.cpp:20: error: no matching function for call to 'strchr(const char [1])' /usr/include/string.h:220: note: candidates are: char* strchr(char*, int) /usr/include/string.h:226: note: const char* strchr(const char*, int) grad.cpp:21: error: expected primary-expression before '}' token grad.cpp:21: error: expected ';' before '}' token