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摘要： 1 //vstart.c 2 #include <stdio.h> 3 #include <strings.h> 4 #include <stdarg.h> 5 int demo(char *fmt, ...); 6 int main() 7 { 8 demo("DEMO", "This", "is", "a", "demo!", ""); 9 return 0;10 } 11 int demo( char *fmt, ... ) 12 { 阅读全文

摘要： DefinitionIn terms of the standardarctanfunction, whose range is(−π/2, π/2), it can be expressed as follows:Notes:This produces results in the range(−π, π], which can be mapped to[0, 2π)by adding2πto negative values.Traditionally,atan2(0, 0)is undefined.The C functionatan2, and most other computer i 阅读全文