Initialization and Floating Problem.

hi friends.this is my first mail to this group.i would             
like to why the following two statements are giving differet        
values to variables.
                     p and s.
                     int p,i=10;
                     p=i++ + i++;//p=20

                     i=10;
                     int s=i++ + i++;//s=21

                     2.
                     float c=0.7;
                     if(c<0.7)
                     printf("yes");
                     else
                     printf("no");

                     output:-yes
                     if i write c<0.7f then it prints no.
                     i would like to know the reason behind this i.e
what's happening internally.



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