View Compilation Error

0_0_22090887_25687.cpp: In function 'int main()':
0_0_22090887_25687.cpp:9:25: error: cannot convert 'int*' to 'const char*' for argument '1' to 'size_t strlen(const char*)'
         int str=strlen(a);
                         ^
0_0_22090887_25687.cpp:15:29: error: cannot convert 'int*' to 'char*' for argument '1' to 'int sprintf(char*, const char*, ...)'
             sprintf(a,"%d",n);
                             ^
0_0_22090887_25687.cpp:16:25: error: cannot convert 'int*' to 'const char*' for argument '1' to 'size_t strlen(const char*)'
             str=strlen(a);
                         ^