linux - Inconsistent value returned by function -

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when call function default_ratio_check(...), confusing value.

const int comp_read_compress = 1; const int comp_write_compress = 0; const int comp_trace_use_default_ratio = 2; double comp_default_ratio = 0.20;  compress_struct* compress_global;  double default_ratio_check( char** s, int i) {     if( s == null ){         if(comp_trace_use_default_ratio ) {             return comp_default_ratio;         }     }     if( comp_read_compress || comp_write_compress ){         if(comp_trace_use_default_ratio ) {             comp_default_ratio = atof( s[i] );             return comp_default_ratio;         }     }     return 0; }

i assign result double type "ratio".

   ratio =  default_ratio_check( (char**)0, 0 );

the value assigned ratio 2.0, value of comp_trace_use_default_ratio instead of comp_default_ratio. change value of comp_trace_use_default_ratio,correspondingly, returned value ratio followed. have use gdb step function, , find works correctly. return value wrong after default_ratio_check() returned. helping. gcc version 5.2.1 20151010; ubuntu 15.10


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