文档介绍：一、、程序中的常用运算符(Operator)和表达式(Expression)..:功能1:按原样输出字符串。printf(“字符串”);功能2:按格式说明符输出对应的数据项。printf("%格式说明符",输出项列表);printf("a=%d,b=%f\n",a,b)inta=1;floatb=2;printf("a=%d,b=%f\n",a,b)变量a对应格式符为%d变量b对应格式符为%f非格式符原样输出,\#include""voidmain(){inta=15,b=-20;longc=45;printf("1:%d%o%x%u\n",a,a,a,a);printf("2:%d%d\n",a,b);printf("3:%d%ld\n",a,c);}程序运行结果为:("%d\n%u\n%x,%X,%o\n",10,10,10,10,10);printf("%d\n%u\n%x,%X,%o\n",-1,-1,-1,-1,-1);1010a,A,----补码补码的最高位为符号位正数最高位为0,负数最高位为1正数的补码就是它本身例如:1的补码(若为短整型,2个字节)0000000000000001负数的补码例如:-1的补码(若为短整型,2个字节)先求它的绝对值为10000000000000001按位取反11111**********最低位加1-1的补码是11111**********例负数的输出printf("%d\n%u\n%x,%X,%o\n",-1,-1,-1,-1,-1);-1的补码是:11111**********-165535ffff,FFFF,#include""voidmain(){inta=97,b=98;printf("1:%d%d\n",a,b);printf("2:%d,%d\n",a,b);printf("3:%c,%c\n",a,b);printf("4:a=%d,b=%d",a,b);}程序运行结果为: