View Compilation Error

0_0_29504793_22756.cpp: In function 'void catalan()':
0_0_29504793_22756.cpp:9:9: error: 'i' was not declared in this scope
     for(i=1;i<36;i++){  
         ^
0_0_29504793_22756.cpp:10:13: error: 'j' was not declared in this scope
         for(j=i;j<=36;j++){  
             ^