View Compilation Error

0_0_29144619_20519.cpp: In function 'int main()':
0_0_29144619_20519.cpp:10:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   if(c==1&&a>='a'&&a<='z')
               ^
0_0_29144619_20519.cpp:10:23: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   if(c==1&&a>='a'&&a<='z')
                       ^
0_0_29144619_20519.cpp:11:5: error: incompatible types in assignment of 'char*' to 'char [105]'
   {a=a-32;c=0;}
     ^