C语言将数字拆大小端存储

爱被打了一巴掌 2023-02-28 12:45 134阅读 0赞

因为任何数字在内存中都是二进制存储，所以根本不需要把十进制数转换成二进制数，直接右移八位即可。

另外buf要定义成无符号数，否则printf会自动补很多ffffff，不信自己试试

#include<stdio.h>
    #include<string.h>
    
    int main(){ 
    	
    	unsigned char buf[300] = { 0}; 
    
    	unsigned int tmp[]={ 
    		52,6,65,52,85,33,99,193,481,574,710,923,1023,1023,
    		1023,1023,817,649,522,424,354,311,274,253,236,222,220,215,219,221,229,237,244,249,252,257,267,277,301,324,372,435,531,661,828,1023,1023,
    		1023,984,753,583,468,379,323,284,255,234,219,211,207,206,207,209,216,223,230,233,234,237,247,255,274,303,340,397,476,602,747,978,1023,
    		1023,872,684,530,430,349,295,258,232,217,205,199,199,194,197,197,204,207,213,218,218,223,230,239,255,274,309,362,430,543,676,899,1023,
    		1023,785,616,483,394,319,271,239,215,203,197,190,188,186,186,185,193,195,198,202,206,208,219,225,236,255,286,332,392,494,618,814,1023,
    		960,727,569,450,359,291,254,223,205,194,187,180,177,177,174,172,178,183,185,190,194,199,206,215,227,241,268,309,368,453,569,740,951,
    		872,668,521,421,331,278,236,212,194,183,178,170,167,164,160,164,170,174,177,180,184,189,195,206,214,229,251,290,338,418,524,674,884,
    		806,626,495,387,305,257,221,200,186,175,173,164,158,154,154,158,162,165,168,171,175,178,187,195,206,216,238,272,323,396,494,636,822,
    
    	};
    
    	int i;
    	int m;
    	int k;
    	for(i=0,k=2;i<300;i++,k+=2){ 
    		
    		buf[k] = tmp[i] & 0xff; 
    		buf[k+1] = (tmp[i] >> 8) & 0xff; 
    	}
    
    	for(m=0;m<300;m++){ 
    		
    		printf("%0x ",buf[m]);
    	}
    	
    	return 0;
    }

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