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    <pre><code>for(i=0;i&lt;Nk*4;i++) { scanf("%x",&amp;Key[i]); } </code></pre> <p>Before getting the filename, you must consume the newline from the stdin. While entering the digits, you enter 1 hex digit per line. So after reading all the Nk*4 digits, there is a newline which is waiting to be consumed. The next statement to get the newline is <code>gets</code> function. It assumes that it has read the filename. The filename obviously does not exist because its empty. The fix is to consume the newline before getting the filename(See snippet)</p> <p>I am not sure what kind of operations <code>Key</code> undergoes. But it must be a <code>unsigned int</code> if it is going to accept hex digits. <code>gets</code> is not recommended. Use <code>fgets</code> instead.</p> <p>Here's a sample snippet you <em>could</em> have posted.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; int main(void) { unsigned int hex[32]={0} ; char line[BUFSIZ] = ""; char filename[64] = ""; int i; printf("Enter 4 hex digits:"); for (i = 0; i &lt; 4; ++i) { printf("&gt;"); scanf("%x", &amp;hex[i]); } printf("The hex digits are:"); for (i = 0; i &lt; 4; ++i) printf("%x", hex[i]); /* Consume newline */ fgets(line, sizeof line, stdin); printf("Enter filename with full path"); if (fgets(filename, sizeof filename, stdin)) { size_t len = strlen(filename); /* has a newline in the end */ filename[len - 1] = '\0'; printf("Filename was %s\n", filename); } else { puts("Cannot read filename"); } return 0; } </code></pre>
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    1. POOutput disappearing after half execution of main() in C
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    1. COStill the problem is there. I have used this code also but still the output disappears
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    2. COYou have statements like `fscanf(fp,"%c",&sig[j]);` after that. I am not sure if you understand what you are doing. Take a step back and please consider refactoring your code.
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    3. CO@PHlfounder This code is working fine separately but when I place it into my code, the output disappears just after getting the key. Showing the same bahaviour as before. Not getting the problem with my code. Please clarify
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