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+{{keywords>wiki library source code example reference}}
+===== strtoul =====
+<code c>
+    #include <stdlib.h>
+    unsigned long int strtoul(const char *str, char **endptr, int base);
+</code>
+strtoul Converting a string to an unsigned long integer\\
+str: the string to be converted\\
+endptr: address of a pointer variable that points to the last character read, so the character that is not owned by a number\\
+base: base between 2 and 36\\
+\\
+Be found unprefixed numbers, these numbers in base 10 are accepted.\\
+If the base '0 'is specified, the strings make a reference to the basis used\\
+(leading "0x" for hexadecimal, "0" for octal, numbers).\\
+===== strtoul c code example =====
+<code c>
+/*
+ * strtoul example code
+ * http://code-reference.com/c/stdlib.h/strtoul
+ */
+#include <stdio.h>
+#include <stdlib.h>
+int main ( void )
+{
+  char string[] ="20405";
+  char *endptr;
+  unsigned long int number;
+  number = strtoul(string, &endptr, 10);
+  printf("string is %s\n",string);
+  printf("unsigned long int is %li\n", number);
+  return 0;
+}
+</code>
+==== Output of strtoul example ====
+    user@host:~$ ./strtoul
+    string is 20405
+    unsigned long int is 20405

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