double p1 = 3.1415926;write(1,&p1,sizeof(p1));//如何输出小数?

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double p1 = 3.1415926;write(1,&p1,sizeof(p1));//如何输出小数?
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double p1 = 3.1415926;write(1,&p1,sizeof(p1));//如何输出小数?
double p1 = 3.1415926;
write(1,&p1,sizeof(p1));//如何输出小数?

double p1 = 3.1415926;write(1,&p1,sizeof(p1));//如何输出小数?
write()函数除去字符串外,任何数据输出你都看不出来(或是看不懂)!
double p1 = 3.1415926;
char str[100];
sprintf(str , "%.7lf" , p1 );
write( 1 , str , strlen(str) );