added stdint.h for fixed width ints

project_euler/Problem 08/sol1.c

@@ -1,20 +1,21 @@
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 
 int64_t get_product(FILE *fp, long start_pos, int num_digits)
 {
-    char ch = ' ';      /* temporary variable to store character read from file */
-    uint8_t num = 0;    /* temporary variable to store digit read */
-    int64_t prod = 1;   /* product accumulator */
-    int count = 0;      /* we use this variable to count number of bytes of file read */
+    char ch = ' ';    /* temporary variable to store character read from file */
+    uint8_t num = 0;  /* temporary variable to store digit read */
+    int64_t prod = 1; /* product accumulator */
+    int count = 0;    /* we use this variable to count number of bytes of file read */
 
     /* accumulate product for num_digits */
-    for(int i = 0; i < num_digits; i++, count++)
+    for (int i = 0; i < num_digits; i++, count++)
     {
         /* get character from file */
         ch = getc(fp);
 
-        /* the ASCII codes of digits is between 0x30 and 0x39. 
+        /* the ASCII codes of digits is between 0x30 and 0x39.
          * any character not in this range implies an invalid character
          */
         if (ch < 0x30 || ch > 0x39)
@@ -24,35 +25,34 @@ int64_t get_product(FILE *fp, long start_pos, int num_digits)
             i--;
             continue;
         }
-        
+
         num = ch - 0x30; /* convert character digit to number */
         if (num == 0)
         {
-            /* If number is zero, we can skip the next 'num_digits' 
+            /* If number is zero, we can skip the next 'num_digits'
              * because this '0' will repeat in the next 'num_digit' multiplications.
              * Hence, we also do not update the file position */
             /* NOTE: this is not needed but helps get results faster :) */
             return 0;
         }
 
-        prod *= num;     /* accumulate product */
+        prod *= num; /* accumulate product */
     }
 
     /* set file position to the next starting character + 1 */
     fseek(fp, -count + 1, SEEK_CUR);
-    
+
     return prod;
 }
 
-
-int main(int argc, char* argv[])
+int main(int argc, char *argv[])
 {
     int position = 0;
     int num_digits = 4;
     int64_t prod, max_prod = 0;
 
     /* if second command-line argument is ge=iven,
-     * use it as the number of digits to compute 
+     * use it as the number of digits to compute
      * successive product for
      */
     if (argc == 2)
@@ -67,24 +67,24 @@ int main(int argc, char* argv[])
     }
 
     /* loop through all digits in the file */
-    do 
+    do
     {
         /* get product of 'num_digits' from current position in file */
         prod = get_product(fp, ftell(fp), num_digits);
-        
+
         if (prod > max_prod)
         {
             max_prod = prod;
             position = ftell(fp) - 1;
         }
-    } while(!feof(fp));      /* loop till end of file is reached */
-    
+    } while (!feof(fp)); /* loop till end of file is reached */
+
     printf("Maximum product: %lld\t Location: %d^th position\n\t", max_prod, position);
-    fseek(fp, position, SEEK_SET);  /* move cursor to identified position in file */
+    fseek(fp, position, SEEK_SET); /* move cursor to identified position in file */
     /* loop through all digits */
     for (; num_digits > 0; num_digits--)
     {
-        char ch = getc(fp);     /* get character */
+        char ch = getc(fp); /* get character */
         /* skip invalid character */
         if (ch < 0x30 || ch > 0x39)
             continue;
@@ -94,7 +94,7 @@ int main(int argc, char* argv[])
             printf("%c = %lld\n", ch, max_prod);
     }
 
-    fclose(fp);     /* close file */
+    fclose(fp); /* close file */
 
     return 0;
 }