Compilare: main.cpp: In function 'int main()': main.cpp:20:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (isalpha(str[i])) ^~ main.cpp:22:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' i++; ^ main.cpp:44:21: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result] system("pause>nul"); ^