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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double norm(double p, int n, double *a) {
  5.   int i;
  6.   double r;
  7.   r = 0.0;
  8.   for (i = 0; i < n; i++)
  9.     r += fabs(pow(a[i], p));
  10.   return pow(r, 1.0 / p);
  11. }
  12.  
  13. int main() {
  14.   double a[] = { 0.5, -0.5 };
  15.   double b[] = { 1.0, 1.0, 1.0, 1.0, 1.0 };
  16.   double c[] = { -1.0, 2.0, 0.0, 3.0 };
  17.   printf("%f\n", norm(1.0, sizeof(a) / sizeof(double), a));
  18.   printf("%f\n", norm(1.0, sizeof(b) / sizeof(double), b));
  19.   printf("%f\n", norm(1.0, sizeof(c) / sizeof(double), c));
  20.   putchar('\n');
  21.   printf("%f\n", norm(2.0, sizeof(a) / sizeof(double), a));
  22.   printf("%f\n", norm(2.0, sizeof(b) / sizeof(double), b));
  23.   printf("%f\n", norm(2.0, sizeof(c) / sizeof(double), c));
  24.   putchar('\n');
  25.   printf("%f\n", norm(3.0, sizeof(a) / sizeof(double), a));
  26.   printf("%f\n", norm(3.0, sizeof(b) / sizeof(double), b));
  27.   printf("%f\n", norm(3.0, sizeof(c) / sizeof(double), c));
  28.   putchar('\n');
  29.   return 0;
  30. }
  31. /* end */
  32.  
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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1.000000
5.000000
6.000000

0.707107
2.236068
3.741657

0.629961
1.709976
3.301927
https://ideone.com/sh4Kz
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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