View Compilation Error

0_0_33768857_13957.cpp: In function 'int main()':
0_0_33768857_13957.cpp:27:4: error: expected ';' before 'for'
    for (int j = 0; i + j <= n; j += 2){
    ^
0_0_33768857_13957.cpp:27:24: error: 'j' was not declared in this scope
    for (int j = 0; i + j <= n; j += 2){
                        ^