Compilare: user.cpp: In function ‘int quantity()’: user.cpp:11:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(c1);++i) ^ user.cpp:17:17: warning: unused variable ‘z’ [-Wunused-variable] int z=i; ^ user.cpp:21:37: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(prcns==')' || prcns>='0' && prcns<='9') ^ user.cpp: In function ‘void ing()’: user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(c1);++i) ^ user.cpp:50:41: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(c1[i]==' ' || c1[i]>='0' && c1[i]<='9'){ ^ user.cpp:51:48: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(c1[i]==' ' || c1[i]>='0' && c1[i]<='9') ^ user.cpp:40:9: warning: unused variable ‘al’ [-Wunused-variable] int al=0,q=0; ^