/in/lab4.c: In function 'my_gcvt':
/in/lab4.c:27:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(sz>=ndigits)
       ^~
/in/lab4.c:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<ndigits-sz&&la>10e-15;i++)
               ^
/in/lab4.c:17:9: warning: unused variable 'times' [-Wunused-variable]
     int times=0;
         ^~~~~
/in/lab4.c: In function 'main':
/in/lab4.c:189:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 0; i < strlen(LineCommand); ++i)
                               ^
/in/lab4.c:193:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 0; i < strlen(LineCommand); ++i)
                               ^
/in/lab4.c:200:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 0; i < strlen(tempname); ++i)
                               ^
/in/lab4.c:255:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i=0;i<strlen(DirPart)-1;i++)
                           ^
/in/lab4.c:300:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < strlen(LineCommand); ++i)
                           ^
/in/lab4.c:332:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < strlen(LineCommand); ++i)
                           ^
/in/lab4.c:337:21: warning: unused variable 'flag2' [-Wunused-variable]
                 int flag2=i;
                     ^~~~~
/in/lab4.c:387:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<strlen(LineCommand);i++)//turn algebra command into IPE
                      ^
/in/lab4.c:392:21: warning: unused variable 'pa' [-Wunused-variable]
                 int pa=i,pb=i;
                     ^~
/in/lab4.c:532:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 0; i < strlen(DIR)-1; ++i)
                               ^
/in/lab4.c:129:27: warning: unused parameter 'argv' [-Wunused-parameter]
 int main(int argc, char** argv) {
                           ^~~~
/in/lab4.c:284:55: warning: 'L2' may be used uninitialized in this function [-Wmaybe-uninitialized]
                 substr(TempCommand,LineCommand,L1+1,L2-L1-1);
                                                     ~~^~~
/in/lab4.c:266:22: warning: 'P2' may be used uninitialized in this function [-Wmaybe-uninitialized]
             for (int i = P2+1; i < 130; ++i) //assume "," appear only once
                      ^
/in/lab4.c:244:22: warning: 'P1' may be used uninitialized in this function [-Wmaybe-uninitialized]
             for (int i = P1+1; i < 120; ++i)
                      ^