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Message: [QUOTE="yong, post: 2453141"] I rewrite my code but the uint64_t seems can't work well. The code is here: ======================== #include <stdio.h> #include <stdint.h> #include "compress.h" int main() { struct code6 mycode6; struct code5 mycode5; mycode6.item1=1; mycode6.item2=2; mycode6.item3=3; mycode6.item4=4; mycode6.item5=5; mycode6.item6=6; mycode5=codecompress(mycode6); printf("mycode5.item1 is: %d\n",mycode5.item1); printf("mycode5.item2 is: %d\n",mycode5.item2); printf("mycode5.item3 is: %d\n",mycode5.item3); printf("mycode5.item4 is: %d\n",mycode5.item4); printf("mycode5.item5 is: %d\n",mycode5.item5); return 0; } ======================== and the compress.h is here: ======================== #include <stdint.h> struct code6 { unsigned long item1; unsigned long item2; unsigned long item3; unsigned long item4; unsigned long item5; unsigned long item6; }; struct code5 { unsigned long item1; unsigned long item2; unsigned long item3; unsigned long item4; unsigned long item5; }; struct code5 codecompress(struct code6 origcode) { struct code5 ret; uint64_t math64; math64=origcode.item1*(256^5)+origcode.item2*(256^4)+origcode.item3*(256^3)+origcode.item4*(256^2)+origcode.item5*256+origcode.item6; printf("math64 is: %X\n",math64); ret.item5=(math64)%(uint64_t)900; math64/=900; ret.item4=(math64)%900; math64/=900; ret.item3=(math64)%900; math64/=900; ret.item2=(math64)%900; math64/=900; ret.item1=(math64)%900; return ret; } ======================== After the code runs it displays that ------------------------ math64 is: F24 mycode5.item1 is: 0 mycode5.item2 is: 0 mycode5.item3 is: 0 mycode5.item4 is: 4 mycode5.item5 is: 276 [/QUOTE]

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