27 lines
763 B
C++
27 lines
763 B
C++
#include "nr.h"
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bool NR::decchk(string str, char &ch)
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{
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char c;
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int j,k=0,m=0;
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static int ip[10][8]={{0,1,5,8,9,4,2,7},{1,5,8,9,4,2,7,0},
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{2,7,0,1,5,8,9,4},{3,6,3,6,3,6,3,6},{4,2,7,0,1,5,8,9},
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{5,8,9,4,2,7,0,1},{6,3,6,3,6,3,6,3},{7,0,1,5,8,9,4,2},
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{8,9,4,2,7,0,1,5},{9,4,2,7,0,1,5,8}};
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static int ij[10][10]={{0,1,2,3,4,5,6,7,8,9},{1,2,3,4,0,6,7,8,9,5},
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{2,3,4,0,1,7,8,9,5,6},{3,4,0,1,2,8,9,5,6,7},{4,0,1,2,3,9,5,6,7,8},
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{5,9,8,7,6,0,4,3,2,1},{6,5,9,8,7,1,0,4,3,2},{7,6,5,9,8,2,1,0,4,3},
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{8,7,6,5,9,3,2,1,0,4},{9,8,7,6,5,4,3,2,1,0}};
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int n=str.length();
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for (j=0;j<n;j++) {
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c=str[j];
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if (c >= 48 && c <= 57)
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k=ij[k][ip[(c+2) % 10][7 & m++]];
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}
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for (j=0;j<10;j++)
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if (ij[k][ip[j][m & 7]] == 0) break;
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ch=char(j+48);
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return k==0;
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}
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