Compilare: main.cpp: In function 'int main()': main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < strlen(c); i++) | ~~^~~~~~~~~~~ main.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 47 | while (i < strlen(c) and isdigit(c[i])) | ~~^~~~~~~~~~~ main.cpp:36:9: warning: unused variable 'val2' [-Wunused-variable] 36 | int val2, val1, val; | ^~~~ main.cpp: In function 'int operatie(char, int, int)': main.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] 29 | } | ^