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    <p>There's a good chance that you're doing this to a string that you have obtained with <code>fgets</code> or a similar input function. In that case, it may well have the newline at the end still.</p> <p>If you change your code temporarily to:</p> <pre><code>void xyz (char *number) { int i = 0, length = strlen (number); while (i &lt; length) printf ("Number[%d]: %c (%d)", i, number[i], number[i]); i++; } } </code></pre> <p>that should also show the numeric codes for all characters.</p> <p>The problem with encoding something like that <code>- 2</code> in your function is that it will not work with:</p> <pre><code>xyz ("123"); </code></pre> <p>since it will stop early, printing out only <code>12</code>. The <em>caller</em> should be calling with valid data, meaning that it should adjust the value to be a numeric string before calling.</p> <hr> <p>You can see this happening in the following program:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; void xyz (char *number) { int i = 0, length = strlen(number) - 2; while(i &lt;= length) { printf("Number[%d]: %c (%d)\n",i, number[i], number[i]); i++; } puts ("==="); } void xyz2 (char *number) { int i = 0, length = strlen(number); while(i &lt; length) { printf("Number[%d]: %c (%d)\n",i, number[i], number[i]); i++; } puts ("==="); } int main (void) { char buff[100]; printf ("Enter number: "); fgets (buff, sizeof (buff), stdin); xyz (buff); xyz ("12345"); xyz2 (buff); xyz2 ("12345"); return 0; } </code></pre> <p>The (annoted) output of this, if you enter <code>98765</code>, is:</p> <pre><code>Enter number: 98765 Number[0]: 9 (57) Number[1]: 8 (56) Number[2]: 7 (55) # Your adjustment works here because of the newline. Number[3]: 6 (54) Number[4]: 5 (53) === Number[0]: 1 (49) Number[1]: 2 (50) Number[2]: 3 (51) # But not here, since it skips last character. Number[3]: 4 (52) === Number[0]: 9 (57) Number[1]: 8 (56) Number[2]: 7 (55) # Here you can see the newline (code 10). Number[3]: 6 (54) Number[4]: 5 (53) Number[5]: (10) === Number[0]: 1 (49) Number[1]: 2 (50) Number[2]: 3 (51) # And proper numeric strings work okay. Number[3]: 4 (52) Number[4]: 5 (53) === </code></pre> <hr> <p>If you're looking for a robust user input function that gets around this problem (and avoids dangerous things like unbounded <code>scanf("%s")</code> and <code>gets</code>), I have one elsewhere on SO (right <a href="https://stackoverflow.com/questions/4023895/how-to-read-string-entered-by-user-in-c/4023921#4023921">HERE</a>, in fact) drawn from my arsenal.</p>
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    1. COThis is brilliant stuff. Thanks a lot man ^_^
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    2. COyour code is working yar.. u should have to init i =0 and its works i checked. you want to remove last 2 character ??
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