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    <p>The code below ensures that the strings can't overflow by making the output string as long as the two input strings, and using <code>fgets()</code> to ensure that there is no overflow of the input strings. One alternative design would do dynamic memory allocation (<code>malloc()</code> et al), at the cost of the calling code having to <code>free()</code> the allocated space. Another design would pass the length of the output buffer to the function so that it could ensure no overflow occurs.</p> <p>The test program doesn't emit prompts: it would not be hard to add a function to do so.</p> <h3>Code</h3> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; void interleave_strings(const char *s1, const char *s2, char *output) { while (*s1 != '\0' &amp;&amp; *s2 != '\0') { *output++ = *s1++; *output++ = *s2++; } while (*s1 != '\0') *output++ = *s1++; while (*s2 != '\0') *output++ = *s2++; *output = '\0'; } int main(void) { char line1[100]; char line2[100]; char output[200]; if (fgets(line1, sizeof(line1), stdin) != 0 &amp;&amp; fgets(line2, sizeof(line2), stdin) != 0) { char *end1 = line1 + strlen(line1) - 1; char *end2 = line2 + strlen(line2) - 1; if (*end1 == '\n') *end1 = '\0'; if (*end2 == '\n') *end2 = '\0'; interleave_strings(line1, line2, output); printf("In1: &lt;&lt;%s&gt;&gt;\n", line1); printf("In2: &lt;&lt;%s&gt;&gt;\n", line2); printf("Out: &lt;&lt;%s&gt;&gt;\n", output); } } </code></pre> <h3>Example output</h3> <pre><code>$ ./interleave abcdefgh 1234 In1: &lt;&lt;abcdefgh&gt;&gt; In2: &lt;&lt;1234&gt;&gt; Out: &lt;&lt;a1b2c3d4efgh&gt;&gt; $ </code></pre>
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    1. POmerging two strings together in C, switching off characters
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    1. USJonathan Leffler
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    1. COThank you Jonathan, your example was very helpful, keep up the good work.
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