View Compilation Error

315926_0_23590.cpp:9: error: field `str' has incomplete type
315926_0_23590.cpp: In function `int main()':
315926_0_23590.cpp:63: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:64: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:65: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:66: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:67: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:68: error: 'struct inf' has no member named 'str'
315926_0_23590.cpp:73: error: 'struct inf' has no member named 'str'