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POc- Strange behavior after getting inputs
 

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  1. POc- Strange behavior after getting inputs
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    <p>I have to make a program that gets as an input a and b, gets as input a number "a" of lines of the following form: "studentId studentName studentPhone" and b lines of input in the form "stId mark1 mark2 mark3". The program then outputs all the stid from the first input and if the same id exists in input b the program outputs the students marks besides its id.</p> <p>I've gone through hell to getting the input properly and I think this is close but I get a strange behavior: after I input the marks in the second input it seems like some of the student ids in the first input are changed. </p> <p>This is my code: (here i try to input just the student IDs. <a href="http://ideone.com/dBYzwe" rel="nofollow">http://ideone.com/dBYzwe</a> )</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; #include &lt;malloc.h&gt; void chomp(char *s); struct listA{ int stId; char stName[19]; char stPhone[12]; }; struct listB{ int stId; char marks[11]; }; int main(void) { int i, j, m, n; scanf("%d%d", &amp;m, &amp;n); struct listA *a = malloc(sizeof(m * sizeof(struct listA))); struct listB *b = malloc(sizeof(n * sizeof(struct listB))); for(i = 0; i &lt; m; i++) { scanf("%d", &amp;a[i].stId); fgets(a[i].stName, 19, stdin); fgets(a[i].stPhone, 11, stdin); chomp(a[i].stName); chomp(a[i].stPhone); } for(i = 0; i &lt; m; i++) printf("%d ", a[i].stId); for(i = 0; i &lt; n; i++) { scanf("%d ", &amp;b[i].stId); fgets(b[i].marks, 12, stdin); fflush(stdin); } printf("\n"); for(i = 0; i &lt; n; i++) { printf("%d ", b[i].stId); } printf("\n"); for(i = 0; i &lt; m; i++) printf("%d ", a[i].stId); return 0; } void chomp(char *s) { while(*s &amp;&amp; *s != '\n' &amp;&amp; *s != '\r') s++; *s = 0; } </code></pre>
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    1. USArlind
    1. USArlind
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    1. CO`a` is not an array, then why do you use `a[i]`?
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      1. POc- Strange behavior after getting inputs
      1. USShubham
    2. COAre you on MS Windows? And which compiler are you using?
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      1. POc- Strange behavior after getting inputs
      1. UShaccks
    3. COI forgot to multiply the sizeof with m and n so they are both arrays. I just did that and it still changes the values of the first input after i get the second input
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      1. POc- Strange behavior after getting inputs
      1. USArlind
 

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