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POassignment of a value to a value changing in for loop
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  1. POassignment of a value to a value changing in for loop
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    copied!<p>in a previous question i had a problem in some code,, after revealed, i had other problem in the code:</p> <pre><code>i=1; double smallest=diff[i][2]; int nxtcty; for (j=2; j&lt;=n; j++) { if (j!=i &amp;&amp; diff[i][j]&lt;smallest) {smallest=diff[i][j]; nxtcty=j;} } </code></pre> <p>the value nxtcty is not changing to j.. it outputs a strange number which i believe it is the memory location content for it >> '134520820'.. what went wrong?? thank you in advance...</p> <p>EDIT for further debugging, here the full code.. it is a very beginner code to calculate distance between several cities with their (x,y) coordinates given:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;math.h&gt; int main() { int i, j, n; ////////////// getting the number of cities /////////////////// printf("how many cities are there?\n"); scanf("%d", &amp;n); printf("so there is %d cities\n", n); int x[n]; int y[n]; ///////////// getting the x coordinates ////////////////////// printf("enter their x coordinates, each followed by return\n"); for (i=0; i&lt;n; i++) { scanf("%d", &amp;x[i]); printf("the %dth city x coordinate is %d\n", i+1, x[i]); } ///////////// getting the y cordinates ///////////////////// printf("enter their y coordinates, each followed by return\n"); for (i=0; i&lt;n; i++) { scanf("%d", &amp;y[i]); printf("the %dth city y coordinate is %d\n", i+1, y[i]); } ////////////// showing information /////////////////////// for (i=0; i&lt;n; i++) { printf("city number %d is at (%d,%d)\n", i+1, x[i], y[i]); } //////////// get the distances ///////////////// double diff[n][n]; double h; for (i=0; i&lt;n; i++) { for (j=0; j&lt;n; j++) { h=((x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j])); printf("city #%d distance %lf from city #%d\n\n", i+1, sqrt(h), j+1); diff[i][j]=sqrt(h); } } for (i=0; i&lt;n; i++) {for (j=0; j&lt;n; j++) { printf("%lf ", diff[i][j]); if (j!=0 &amp;&amp; n % (j+1)==0){printf("\n");}} } i=0; double smallest=diff[i][1]; printf("smallest_initial %lf \n",smallest); int nxtcty=77; printf("nxtcty_initial %d\n",nxtcty); for (j=1; j&lt;=n; j++) { printf("j_b4_if: %d, smallest_b4_if: %lf, nxtcty_b4_if: %d\n",j, smallest, nxtcty); if ( diff[i][j]&lt;smallest ) {smallest=diff[i][j]; nxtcty=j; printf("j_in_if: %d, smallest_in_if: %lf, nxtcty_in_if: %d\n",j, smallest, nxtcty); } printf("j_in_for: %d, smallest_in_for: %lf, nxtcty_in_for: %d\n",j, smallest, nxtcty); } printf("j %d,, nxtcty %d\n", j, nxtcty); return 0; } </code></pre>
 

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