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    <p>Normally, you have to define the priority of each operation and process each of them one by one.</p> <pre><code> First your expression is: '`[ 5,-1, 6,-4,20,-2, 4]`' Do all '/' first: '`[ 5,-1, 6,-4, <b>5,-1, 0</b>]`' &lt;- 20/ 4 = 5+0 Then, do all '*': '`[ 5,-1,<b>30,-1, 0</b>,-1, 0]`' &lt;- 6* 5 = 30+0 Then, do all '-': '`[ 5,-1,30,-1, 0,-1, 0]`' &lt;- Nothing Then, do all '+' (sum positive): '`[<b>35,-1, 0,-1, 0,-1, 0</b>]`' &lt;- 5+30+0+0 = 35 + 0 + 0 </code></pre> <p><b>ADDED: </b> Here is the C code.</p> <pre><code>void ShowArray(int pX[], int pLength) &#123; int i; for(i = 0; i &lt; pLength; i++) printf("%3d ", pX[i]); printf("\n"); &#125; &nbsp; void ShiftArray(int pX[], int pIndex, int pSkip, int pLength) &#123; int i; for(i = pIndex; i &lt; (pLength - pSkip); i++) pX[i] = pX[i + pSkip]; &nbsp; for(i = (pLength - pSkip); i &lt; pLength; i++) pX[i] = 0; &#125; &nbsp; int main(void) &#123; const int OPERCOUNT = 4; const int PLUS = -1; // -1 Do last const int SUBT = -2; const int MULT = -3; const int DIV = -4; // -4 Do first &nbsp; int X[] = &#123;5, PLUS, 6, MULT, 20, DIV, 4&#125;; int XCount = 7; &nbsp; ShowArray(X, XCount); &nbsp; int i; for(i = OPERCOUNT; --i &gt;= 0; ) &#123; int OPER = -(i + 1); int j = 0; for(j = 0; j &lt; XCount; j++) &#123; int x = X[j]; if (x == OPER) &#123; if (x == PLUS) X[j - 1] = X[j - 1] + X[j + 1]; else if (x == SUBT) X[j - 1] = X[j - 1] - X[j + 1]; else if (x == MULT) X[j - 1] = X[j - 1] * X[j + 1]; else if (x == DIV ) X[j - 1] = X[j - 1] / X[j + 1]; ShiftArray(X, j, 2, XCount); &#125; &#125; &nbsp; ShowArray(X, XCount); &#125; &nbsp; int Sum = 0; int j; for(j = 0; j &lt; XCount; j++) &#123; int x = X[j]; if (x &gt; 0) Sum += x; &#125; printf("Result: %d\n", Sum); &#125; </code></pre> <p>And here is the result:</p> <pre><code> 5 -1 6 -3 20 -4 4 5 -1 6 -3 5 0 0 5 -1 30 0 0 0 0 5 -1 30 0 0 0 0 35 0 0 0 0 0 0 Result: 35 </code></pre> <p>This should works.</p> <p>Enjoy coding.</p>
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    1. COIf you do all division first then you risk losing data and getting an incorrect result. e.g. 4*3/2... division first gets you 8... multiplication first gets you 6.
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    2. COYou are right but as I said. It depends on the priority of each operator. You may choose others. If you do '/' later you may end up the non-sense value like `3/2-1 = 1`. :-D
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