这对cout来说绝对是暴击,std::print的易用性和性能简直完爆它。 其语法就是Formatting Library的格式化语法。 性能对比: 结果显示,printf与print几乎要比cout快三倍,print默认会打印到stdout。当打印到cout并同步标准C的流时(print_cout_sync),print大概要快14%;当不同步标准C的流时(print_cout),依旧要快不少。
2 #define DBGPRINT(format, args...) \ 3 fprintf(stderr, format, ##args) 4 #else 5 #define DBGPRINT(format, args...) 6 #endif 这样定义之后,代码中就可以用dbgprint了,例如dbgprint ("aaa [%s]", __FILE__)。 结合第4节的“条件编译”功能,可以构造出如下调试打印宏: 1 #ifdef LOG_TES...
#include <iomanip.h> using namespace std; int main() { cout<<12345.0<<endl;//输出"12345" cout<<setiosflags(ios::fixed)<<setprecision(3)<<1.2345<<endl;输出"1.235" cout<<setiosflags(ios::scientific)<<12345.0<<endl;//输出"1.234500e+004 " cout<<setprecision(3)<<12345.0<<endl;//输出"1....
PS E:\22-Programming\11-VsCodeC\1-test\01-2021.09.01-printf宏定义打印>gcc'main.c'-o'main.exe'-Wall-O2-m64-lm-static-libgcc-std=c11-fexec-charset=GBK ;if($?) { &'./main.exe'} startprint... my name is 编码小二 end print... PS E:\22-Programming\11-VsCodeC\1-test\01-2021.0...
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用va_xxx的宏应该也是可以的 #include<stdio.h>#include<stdarg.h>intcall_printf(){constchar*mystr...
intmain(){HANDLEhandle=GetStdHandle(STD_OUTPUT_HANDLE);CONSOLE_CURSOR_INFOcursor_info;GetConsoleCursorInfo(handle,&cursor_info);return0;} 就是把控制台里面的光标信息放在 cursor_info放在里面,所以GetConsoleCursorInfo(handle, &cursor_info),里就传了地址。
void * operator new(std::size_t, std::size_t); void operator delete(void*, std::size_t) noexcept; The problem occurs because of the match in function signatures between a placement delete operator you've defined, and the new global sized delete operator. Consider whether you can use ...
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(resolution,"width",width);height=cJSON_CreateNumber(resolution_numbers[index][1]);if(height==NULL) { gotoend; }cJSON_AddItemToObject(resolution,"height",height); }string=cJSON_Print(monitor);if(string==NULL) {fprintf(stderr,"Failed to print monitor.\n"); }end:cJSON_Delete(monitor);...