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View Compilation Error

0_0_29471978_25009.cpp:1:1: error: expected unqualified-id before 'while'
 while( len < 2*len1 )len <<= 1;
 ^
0_0_29471978_25009.cpp:2:9: error: expected unqualified-id before 'for'
         for(int i = 0;i < len1;i++)
         ^
0_0_29471978_25009.cpp:2:23: error: 'i' does not name a type
         for(int i = 0;i < len1;i++)
                       ^
0_0_29471978_25009.cpp:2:32: error: 'i' does not name a type
         for(int i = 0;i < len1;i++)
                                ^
0_0_29471978_25009.cpp:4:9: error: expected unqualified-id before 'for'
         for(int i = len1;i < len;i++)
         ^
0_0_29471978_25009.cpp:4:26: error: 'i' does not name a type
         for(int i = len1;i < len;i++)
                          ^
0_0_29471978_25009.cpp:4:34: error: 'i' does not name a type
         for(int i = len1;i < len;i++)
                                  ^
0_0_29471978_25009.cpp:6:12: error: expected constructor, destructor, or type conversion before '(' token
         fft(x1,len,1);
            ^
0_0_29471978_25009.cpp:7:9: error: expected unqualified-id before 'for'
         for(int i = 0;i < len;i++)
         ^
0_0_29471978_25009.cpp:7:23: error: 'i' does not name a type
         for(int i = 0;i < len;i++)
                       ^
0_0_29471978_25009.cpp:7:31: error: 'i' does not name a type
         for(int i = 0;i < len;i++)
                               ^
0_0_29471978_25009.cpp:9:12: error: expected constructor, destructor, or type conversion before '(' token
         fft(x1,len,-1);
            ^
0_0_29471978_25009.cpp:10:9: error: expected unqualified-id before 'for'
         for(int i = 0;i < len;i++)
         ^
0_0_29471978_25009.cpp:10:23: error: 'i' does not name a type
         for(int i = 0;i < len;i++)
                       ^
0_0_29471978_25009.cpp:10:31: error: 'i' does not name a type
         for(int i = 0;i < len;i++)
                               ^


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