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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main(void)
  5. {
  6.     double value;
  7.     char from[30];
  8.     char to[30];
  9.     double result;
  10.  
  11.     printf("Enter value: ");
  12.     scanf("%lf", &value);
  13.  
  14.     printf("Enter source unit: ");
  15.     scanf("%29s", from);
  16.  
  17.     printf("Enter target unit: ");
  18.     scanf("%29s", to);
  19.  
  20.     if (strcmp(from, "meters") == 0 &&
  21.         strcmp(to, "feet") == 0)
  22.     {
  23.         result = value * 3.28084;
  24.     }
  25.     else if (strcmp(from, "feet") == 0 &&
  26.              strcmp(to, "meters") == 0)
  27.     {
  28.         result = value / 3.28084;
  29.     }
  30.     else if (strcmp(from, "kilograms") == 0 &&
  31.              strcmp(to, "pounds") == 0)
  32.     {
  33.         result = value * 2.20462;
  34.     }
  35.     else if (strcmp(from, "pounds") == 0 &&
  36.              strcmp(to, "kilograms") == 0)
  37.     {
  38.         result = value / 2.20462;
  39.     }
  40.     else if (strcmp(from, "liters") == 0 &&
  41.              strcmp(to, "gallons") == 0)
  42.     {
  43.         result = value * 0.264172;
  44.     }
  45.     else if (strcmp(from, "gallons") == 0 &&
  46.              strcmp(to, "liters") == 0)
  47.     {
  48.         result = value / 0.264172;
  49.     }
  50.     else
  51.     {
  52.         printf("Invalid conversion.\n");
  53.         return 0;
  54.     }
  55.  
  56.     printf("%.2f %s = %.2f %s\n",
  57.            value, from, result, to);
  58.  
  59.     return 0;
  60. }
Success #stdin #stdout 0s 5344KB
comments (?)
stdin
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Standard input is empty
stdout
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Enter value: Enter source unit: Enter target unit: Invalid conversion.
https://ideone.com/U46Lth
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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