/in/lab5.c: In function 'main':
/in/lab5.c:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
          for(int i = 0;i < sizeof(str);i++){
                          ^
/in/lab5.c:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
          for(int i = 0;i < sizeof(str);i++){
                          ^
/in/lab5.c: In function 'assign':
/in/lab5.c:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i < strlen(inp);i++){
                  ^
/in/lab5.c: In function 'calculate':
/in/lab5.c:191:15: warning: unused variable 'j' [-Wunused-variable]
  int top = 0, j = 0;
               ^