/in/lab5.c: In function 'rpe':
/in/lab5.c:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<strlen(input); i++){
                    ^
/in/lab5.c:55:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (int t=0; t<strlen(varn); t++){
                                ^
/in/lab5.c:80:24: warning: unused variable 'element' [-Wunused-variable]
                 double element=oper[--o]; oper[o]=0;
                        ^~~~~~~
/in/lab5.c:114:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int t=0; t<strlen(varn); t++){
                        ^
/in/lab5.c:47:21: warning: unused variable 'n' [-Wunused-variable]
     int o=0,r=0,h=0,n=0,time=0,vn=0,t0=0;
                     ^
/in/lab5.c: In function 'main':
/in/lab5.c:181:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i=0;i<strlen(left);i++){vars[v][i]=left[i];}
                          ^
/in/lab5.c:191:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int i=0;i<strlen(left);i++){vars[v][i]=left[i];}
                              ^
/in/lab5.c:159:10: warning: unused variable 'var' [-Wunused-variable]
     char var[120]={'\0'};//读取到的变量名字
          ^~~
/in/lab5.c:156:9: warning: unused variable 'varnums' [-Wunused-variable]
     int varnums=0; //变量个数
         ^~~~~~~