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POHow to read empty string in C
 

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  1. POHow to read empty string in C
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    <p>I have a problem with reading empty string in C. I want to read string from the following -</p> <ol> <li>ass</li> <li>ball</li> <li>(empty)</li> <li>cat</li> </ol> <p>but when I use <code>gets()</code> it does not treat <code>(empty)</code> as string[2]. It reads 'cat' as string[2]. So how can I solve this problem?</p> <pre><code>char str1[15002][12]; char str2[15002][12]; char s[25]; map&lt;string,int&gt; Map; int main() { int ncase, i, j, n1, n2, count, Case; freopen("input.txt","r",stdin); freopen("output.txt","w",stdout); scanf("%d",&amp;ncase); Case = 1; while(ncase &gt; 0) { Map.clear(); //this is the necessery part scanf("%d %d\n",&amp;n1,&amp;n2); count = 0; printf("n1=%d n2=%d\n",n1,n2); for(i = 0; i &lt; n1; i++) { gets(str1[i]); } for(i = 0; i &lt; n2; i++) { gets(str2[i]); } //end of reading input for(i = 0; i &lt; n1; i++) { for(j = 0; j &lt; n2; j++) { strcpy(s,str1[i]); strcat(s,str2[j]); if(Map[s] == 0){ count += 1; Map[s] = 1; } } } printf("Case %d: %d\n", Case, count); Case++; ncase--; } return 0; } </code></pre> <p>and input can look like</p> <p>I have given the code here. The input may be like</p> <pre><code>line1&gt;1 line2&gt;3 3 line3&gt;(empty line) line4&gt;a line5&gt;b line6&gt;c line7&gt;(empty) line8&gt;b </code></pre> <p>And I expect</p> <pre><code>str1[0]=(empty). str1[1]=a; str1[2]=b; </code></pre> <p>and</p> <pre><code>str2[0]=c; str2[1]=(empty); str2[2]=b; </code></pre> <p><br><br><br> OK, at last I found the problem. It is the line </p> <pre><code>printf("n1=%d n2=%d\n",n1,n2); </code></pre> <p>which creates problem in taking input by <code>gets()</code>. Instead of taking newline with the integer <code>n1</code>, <code>n2</code>, then I take newline as a (<code>"%c",&amp;ch</code>) and then everything is okay.</p> <p>Thanks to everyone who answered me.</p>
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    1. USJonathan Leffler
    1. USrussell
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      1. POHow to read empty string in C
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    1. COcheck what is string[2]?
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    2. COIs this a text file where the third line is empty?
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      1. USAndreas Brinck
    3. COyes,this is a text file.
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