View Compilation Error

0_0_35072022_24017.cpp:1:1: error: expected unqualified-id before 'for'
 for(i=0;i<=a[1]*b[1];i=i+a[1])
 ^
0_0_35072022_24017.cpp:1:9: error: 'i' does not name a type
 for(i=0;i<=a[1]*b[1];i=i+a[1])
         ^
0_0_35072022_24017.cpp:1:22: error: 'i' does not name a type
 for(i=0;i<=a[1]*b[1];i=i+a[1])
                      ^
0_0_35072022_24017.cpp:3:9: error: expected unqualified-id before 'for'
         for(i=2;i<=n;i++)
         ^
0_0_35072022_24017.cpp:3:17: error: 'i' does not name a type
         for(i=2;i<=n;i++)
                 ^
0_0_35072022_24017.cpp:3:22: error: 'i' does not name a type
         for(i=2;i<=n;i++)
                      ^