/in/lab4.c: In function 'convert2postfix':
/in/lab4.c:74:9: warning: value computed is not used [-Wunused-value]
         *pdst++;
         ^~~~~~~
/in/lab4.c: In function 'strfind1':
/in/lab4.c:131:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i=0;i<strlen(arr);i++){
                    ^
/in/lab4.c: In function 'main':
/in/lab4.c:143:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
               if(a[0]='f'&&a[1]=='p'&&a[2]=='r'&&a[3]=='i'&&a[4]=='n'&&a[5]=='t'&&a[6]=='f'){
                  ^