View Compilation Error

0_0_35058159_16257.cpp: In function 'int main()':
0_0_35058159_16257.cpp:19:7: error: 'i' was not declared in this scope
   for(i=1;i<=len1;i++){
       ^
0_0_35058159_16257.cpp:24:7: error: 'i' was not declared in this scope
   for(i=1;i<=len2;i++){
       ^
0_0_35058159_16257.cpp:29:8: error: 'i' was not declared in this scope
    for(i=0;i<max;i++){
        ^
0_0_35058159_16257.cpp:37:8: error: 'i' was not declared in this scope
    for(i=len1;i>0;i--)
        ^
0_0_35058159_16257.cpp:43:8: error: 'i' was not declared in this scope
    for(i=0;i<max;i++){
        ^
0_0_35058159_16257.cpp:51:8: error: 'i' was not declared in this scope
    for(i=len2;i>0;i--)
        ^