新思维：C语言程序设计

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    2    3    4    5    6    8    9   10   12   15
   16   18   20   24   25   27   30   32   36   40
   45   48   50   54   60   64   72   75   80   81
   90   96  100  108  120  125  128  135  144  150

2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 32 36 40 45 48 50 54 60 64 72 75 80 81 90 96 100 108 120 125 128 135 144 150

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#include <stdio.h>
int main(int argc, char *argv[])
{
    int i, b, n, sum;
    char s[100];
    while (scanf("%d%s", &b, s)!=EOF)
    {
        n = strlen(s);
        sum = 0;
        for(i=0; i<n; i++) 
            sum +=  (s[i]-'0')*pow(b, n-1-i);
        printf("%d", sum);
    }
   return 0;
}

#include <stdio.h> int main(int argc, char *argv[]) { int i, b, n, sum; char s[100]; while (scanf("%d%s", &b, s)!=EOF) { n = strlen(s); sum = 0; for(i=0; i<n; i++) sum += (s[i]-'0')*pow(b, n-1-i); printf("%d", sum); } return 0; }