/in/lab5.c: In function 'changetodouble':
/in/lab5.c:147:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(A[i]<='9'&& A[i]>='0'||A[i]=='.') 
            ~~~~~~~~~^~~~~~~~~~~~
/in/lab5.c: In function 'calculate':
/in/lab5.c:267:9: warning: unused variable 'top' [-Wunused-variable]
     int top=0,i=0,j=0;
         ^~~
/in/lab5.c: In function 'splitequations':
/in/lab5.c:83:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/lab5.c: In function 'operatorcmp':
/in/lab5.c:104:8: warning: 'num2' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (num1>num2) return 1;
        ^
/in/lab5.c:104:8: warning: 'num1' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/lab5.c: In function 'calculate':
/in/lab5.c:283:23: warning: 'num' may be used uninitialized in this function [-Wmaybe-uninitialized]
             stack[j-2]=num;
             ~~~~~~~~~~^~~~