fork(1) download
copy 
  1. #include <stdio.h>
  2. #include <math.h>
  3. #include <string.h>
  4. #include <stdlib.h>
  5.  
  6. typedef double (*funcptr_t)(double);
  7.  
  8. struct FunctionTable {
  9.     const char *s;
  10.     const funcptr_t f;
  11. };
  12.  
  13. int main() {
  14.     const static struct FunctionTable t[] = {{"sin", sin}, {"cos", cos}, {"exp", exp}, {"log", log}, {"tan", tan}, {"sqrt", sqrt}};
  15.     char *s;
  16.     double d;
  17.     while (scanf("%ms%lf", &s, &d) != EOF) {
  18.         int size = sizeof(t) / sizeof(struct FunctionTable);
  19.         int found = 0;
  20.         for (int i = 0; i < size; ++i) {
  21.             if (strcmp(t[i].s, s) == 0) {
  22.                 found = 1;
  23.                 printf("%a\n", t[i].f(d));
  24.                 break;
  25.             }
  26.         }
  27.         if (found == 0) {
  28.             printf("nan\n");
  29.         }
  30.     }
  31.     //free(fname);
  32.     return 0;
  33. }
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
copy 
sin 0.5
log 0
log10 10
sqrt 4
cos 0.00001
stdout
copy 
0x1.eaee8744b05fp-2
-inf
nan
0x1p+1
0x1.ffffffff920c8p-1
https://ideone.com/K37aCn
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!