/in/hw4.c: In function 'main':
/in/hw4.c:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(m=0;m<strlen(hexsum);m++)
                  ^
/in/hw4.c:95:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(n=0;n<strlen(hexdiff);n++)
                  ^
/in/hw4.c:9:32: warning: iteration 299 invokes undefined behavior [-Waggressive-loop-optimizations]
     for(a=0;a<=299;a++) hex1[a]='0';
                         ~~~~~~~^~~~
/in/hw4.c:9:5: note: within this loop
     for(a=0;a<=299;a++) hex1[a]='0';
     ^~~
/in/hw4.c:10:32: warning: iteration 299 invokes undefined behavior [-Waggressive-loop-optimizations]
     for(b=0;b<=299;b++) hex2[b]='0';
                         ~~~~~~~^~~~
/in/hw4.c:10:5: note: within this loop
     for(b=0;b<=299;b++) hex2[b]='0';
     ^~~
/in/hw4.c:11:34: warning: iteration 299 invokes undefined behavior [-Waggressive-loop-optimizations]
     for(c=0;c<=299;c++) hexsum[c]=0;
                         ~~~~~~~~~^~
/in/hw4.c:11:5: note: within this loop
     for(c=0;c<=299;c++) hexsum[c]=0;
     ^~~
/in/hw4.c:12:35: warning: iteration 299 invokes undefined behavior [-Waggressive-loop-optimizations]
     for(d=0;d<=299;d++) hexdiff[d]=0;
                         ~~~~~~~~~~^~
/in/hw4.c:12:5: note: within this loop
     for(d=0;d<=299;d++) hexdiff[d]=0;
     ^~~