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    <p>Usually given a string:</p> <pre><code>char * myStr= "123"; </code></pre> <p>the way to obtain it's value as an int is:</p> <pre><code>int value=atoi(myStr); </code></pre> <p>Some things important to notice:</p> <p>the following include is necessary:</p> <pre><code>#include &lt;stdlib.h&gt; </code></pre> <p>and you must be sure that your string is a null terminated string otherwise atoi will crash you program.</p> <p>You didn't gave us much information but if you're programming a microcontroller (I suspect that since you told us about a motor) you maybe won't want to use stdlib. In that case you might have use a costum function.</p> <p>Please take a look at the code bellow:</p> <pre><code>int stringToInt(char* nrStr){ int nrChars=0; while(nrStr[nrChars]!='\0'){ nrChars++; } int result=0; int i=0; while(nrStr[i]!='\0'){//while you dont get to the end of the string int digit=nrStr[i]-48;//48 is zero ascii code int exp=nrChars-i-1; int add=digit*power(10,exp); result+=add; i++; } return result; } int power(int base, int exp){ int ret=1; int i; for(i=0;i&lt;exp;i++){ ret*=base; } return ret; } </code></pre> <p>This does not use any library functions and does the job. I've done it in 3 minutes and it may have some small error, it's not very efficient and does not verify possible errors, but in principle if you pass the strinToint function a well formed integer as a null terminated string it will output the correct value.</p> <p>If you're using a library that does have some implementation of a power function do use it instead of the one I gave you since it is not efficient at all.</p> <p>One last note: if you for some reason need to use it in other basis lets say octal basis, you have to chance the line:</p> <pre><code>int add=digit*power(10,exp); </code></pre> <p>to:</p> <pre><code> int add=digit*power(8,exp); </code></pre> <p>for hexadecimal this will not work, and implementation of such a function will be significantly different.</p>
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    1. COyea dats fine but the string doesnt give the exact ascii value.its showing some garbage value after conversion since its a character constant.
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