数据转换-整数字节数组

1.c

#include<stdio.h>
#include<string.h>
#include"utils.h"

//20211102
int main() {
	int p;
	char bytearr[100];
	printf("请输入一个整型数字\n");
	scanf("%d",&p);
	printf("把整型数转化为字节数组\n");
	Int2ByteArr(p,bytearr);
	// 给长度为奇数的字符串首位加一个0
	int length = strlen(bytearr);
	if (length % 2 != 0) {
		memmove(bytearr + 1, bytearr, length + 1);
		bytearr[0] = '0';
	}
	printf("字节数组为:");
	printf("{%s}\n",bytearr);

	char barr[100];
	int h;
	printf("请输入一个字节数组:");
	scanf("%s",barr);
	printf("把字节数组转化为整型数字:");
	ByteArr2Int(barr,&h);
	printf("%d\n",h);
}

utils.c

#include<stdio.h>
#include"utils.h"
#include<string.h>
//20211102
int Hex2Char(int fromi,char *toc) {
	if(fromi>=0&&fromi<=9) {
		*toc= fromi+'0';
	} else if(fromi>=10&&fromi<=15) {
		*toc = fromi+'A'-10;
	} else {
		printf("输入的16进制数据不正确！");
	}
	return 0;
}

int Char2Hex(char fromc,int *toi) {
	if(fromc>='0'&& fromc<='9') {
		*toi= fromc-'0';
	} else if(fromc>='A'&& fromc<='F') {
		*toi= fromc-'A'+10;

	} else {
		printf("输入的16进制字符不正确");
	}
	return 0;
}

int Int2ByteArr(int i,char *ba) {
	int j;
	int a;
	int sum=0;
	int k=i;
	for(j=0;; j++) {
		k=k/16;
		if(k!=0)
			sum++;
		else
			break;
	}
	for(j=sum; j>=0; j--) {
		a = i%16;
		Hex2Char(a,&ba[j]);
		i=i/16;

	}
	ba[sum+1]='\0';
}

int ByteArr2Int(char *ba,int *i) {
	int len;
	int j;
	int n=0;
	*i=0;
	len = strlen(ba);
	for(j=0; j<len; j++) {
		Char2Hex(ba[j],&n);
		//printf("%d\n",n);
		*i=(*i)*16+n;

	}
}

utils.h

#ifndef _UTIL_H_
#define _UTIL_H_

//char Hex2Char(int i);
//int Char2Hex(char c);

int Hex2Char(int fromi,char * toc);
int Char2Hex(char fromc,int * toi);

int Bitstr2ByteArr(char * bs,char * ba);
int ByteArr2Bitstr(char * ba,char * bs);

int Int2ByteArr(int i,char * ba);
int ByteArr2Int(char * ba,int * i);

#endif