/in/ex3.c: In function 'main':
/in/ex3.c:10:5: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
     gets(str);
     ^~~~
/in/ex3.c:8:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,x;
           ^
/in/ex3.c:8:9: warning: unused variable 'i' [-Wunused-variable]
     int i,j,x;
         ^
/tmp/ccXs4sNz.o: In function `main':
ex3.c:(.text.startup+0x44): warning: the `gets' function is dangerous and should not be used.