Compilare: main.cpp: In function 'long long int eval_exp(char*, int)': main.cpp:61:37: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] if(ptr = urm_elem(&a[0], "+-", n)) ^ main.cpp:61:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(ptr = urm_elem(&a[0], "+-", n)) ^ main.cpp:69:37: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] if(ptr = urm_elem(&a[0], "*/", n)) ^ main.cpp:69:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(ptr = urm_elem(&a[0], "*/", n)) ^ main.cpp:77:36: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] if(ptr = urm_elem(&a[0], "^", n)) ^ main.cpp:77:37: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(ptr = urm_elem(&a[0], "^", n)) ^