Introduction - If you have any usage issues, please Google them yourself
/* 十进制输出*/
printf("int_a = #o\n",int_a) /* 带标识符八进制输出*/
printf("int_a = #x\n",int_a) /* 带标识符十六进制输出*/
printf("char_e = c\n",char_e) /* 字符输出*/
printf("float_pi = f\n",float_pi) /* 实型输出*/
printf("double_g = 15.14g\n",double_pi) /* 15位双精度输出,其中13位小数*/