C语言实现 数据类型占多少字节指针占多少字节
具体代码如下所示:
#includevoidmain() { //使用sizeof验证数据类型在内存中占用的空间大小 //char //int //short //long //unsignedint //float //double //longdouble printf("在64位机器中:\n"); printf("char类型占%d个字节\n",sizeof(char)); printf("short类型占%d个字节\n",sizeof(short)); printf("int类型占%d个字节\n",sizeof(int)); printf("long类型占%d个字节\n",sizeof(long)); printf("unsignedint类型占%d个字节\n",sizeof(unsignedint)); printf("float类型占%d个字节\n",sizeof(float)); printf("double类型占%d个字节\n",sizeof(double)); printf("longdouble类型占%d个字节\n",sizeof(longdouble)); printf("-------------------指针占4个字节---------------------\n"); char*p0; short*p1; int*p2; long*p3; unsignedint*p4; float*p5; double*p6; longdouble*p7; printf("char类型指针占%d个字节\n",sizeof(p0)); printf("short类型指针占%d个字节\n",sizeof(p1)); printf("int类型指针占%d个字节\n",sizeof(p2)); printf("long类型指针占%d个字节\n",sizeof(p3)); printf("unsignedint类型指针占%d个字节\n",sizeof(p4)); printf("float类型指针占%d个字节\n",sizeof(p5)); printf("double类型指针占%d个字节\n",sizeof(p6)); printf("longdouble类型指针占%d个字节\n",sizeof(p7)); }
结果:
在64位机器中: char类型占1个字节 short类型占2个字节 int类型占4个字节 long类型占4个字节 unsignedint类型占4个字节 float类型占4个字节 double类型占8个字节 longdouble类型占12个字节 -------------------指针占4个字节--------------------- char类型指针占4个字节 short类型指针占4个字节 int类型指针占4个字节 long类型指针占4个字节 unsignedint类型指针占4个字节 float类型指针占4个字节 double类型指针占4个字节 longdouble类型指针占4个字节
知识点扩展:
c语言实现十进制与ASCII码互转
//十进制转ASCII码 //年#defineKB2ASC(x)(u8)(0x30+x) //ASCII码转十进制 //年 #defineASC2KB(x)(u8)(x%(0x30))
总结
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