Compilare: main.cpp: In function 'int main()': main.cpp:39:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < strlen(c); i++) | ~~^~~~~~~~~~~ main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 48 | while (i < strlen(c) and isdigit(c[i])) | ~~^~~~~~~~~~~ main.cpp: In function 'int operatie(char, int, int)': main.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] 30 | } | ^