40 lines
697 B
C
40 lines
697 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <time.h>
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#include "projecteuler.h"
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int main(int argc, char **argv)
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{
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int found = 0;
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long int i, n;
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double elapsed;
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struct timespec start, end;
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clock_gettime(CLOCK_MONOTONIC, &start);
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i = 143;
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while(!found)
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{
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i++;
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n = i * (2 * i - 1);
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if(is_pentagonal(n))
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{
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found = 1;
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}
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}
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clock_gettime(CLOCK_MONOTONIC, &end);
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elapsed = (end.tv_sec - start.tv_sec) + (double)(end.tv_nsec - start.tv_nsec) / 1000000000;
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printf("Project Euler, Problem 45\n");
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printf("Answer: %ld\n", n);
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printf("Elapsed time: %.9lf seconds\n", elapsed);
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return 0;
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}
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