View Compilation Error

0_0_20876975_6162.cpp: In function 'int main()':
0_0_20876975_6162.cpp:15:1: error: 't' was not declared in this scope
 t=ch[j];
 ^
0_0_20876975_6162.cpp:24:1: error: expected '}' at end of input
 }
 ^