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< a href = "#func-members" > Functions< / a > < / div >
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< div class = "headertitle" > < div class = "title" > collatz.c File Reference< / div > < / div >
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< p > Implementation of < a href = "https://en.wikipedia.org/wiki/Collatz_conjecture" target = "_blank" > Collatz' conjecture< / a >
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< a href = "#details" > More...< / a > < / p >
< div class = "textblock" > < code > #include < stdio.h> < / code > < br / >
< code > #include < stdlib.h> < / code > < br / >
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Include dependency graph for collatz.c:< / div >
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< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../d0/db8/collatz_8c__incl.svg" width = "160" height = "112" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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Functions< / h2 > < / td > < / tr >
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< tr class = "memitem:a0ddf1224851353fc92bfbff6f499fa97" > < td class = "memItemLeft" align = "right" valign = "top" > int  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../dc/d80/collatz_8c.html#a0ddf1224851353fc92bfbff6f499fa97" > main< / a > (int argc, char *argv[])< / td > < / tr >
< tr class = "memdesc:a0ddf1224851353fc92bfbff6f499fa97" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Main function. < a href = "../../dc/d80/collatz_8c.html#a0ddf1224851353fc92bfbff6f499fa97" > More...< / a > < br / > < / td > < / tr >
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< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
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< div class = "textblock" > < p > Implementation of < a href = "https://en.wikipedia.org/wiki/Collatz_conjecture" target = "_blank" > Collatz' conjecture< / a > < / p >
< p > Collatz conjecture: a series for a number \(n\) in which if \(n\) even then the next number is \(\frac{n}{2}\) ,but if n is odd then the next number is \(3n+1\). This series continues till \(n\) reaches 1 < / p >
< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
< a id = "a0ddf1224851353fc92bfbff6f499fa97" name = "a0ddf1224851353fc92bfbff6f499fa97" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a0ddf1224851353fc92bfbff6f499fa97" > ◆ < / a > < / span > main()< / h2 >
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< div class = "memproto" >
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< td class = "memname" > int main < / td >
< td > (< / td >
< td class = "paramtype" > int  < / td >
< td class = "paramname" > < em > argc< / em > , < / td >
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< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > char *  < / td >
< td class = "paramname" > < em > argv< / em > []  < / td >
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< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
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< p > Main function. < / p >
< div class = "fragment" > < div class = "line" > < a id = "l00017" name = "l00017" > < / a > < span class = "lineno" > 17< / span > {< / div >
< div class = "line" > < a id = "l00018" name = "l00018" > < / a > < span class = "lineno" > 18< / span > < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > long< / span > < span class = "keywordtype" > long< / span > n, curr_no, num_steps = 0;< / div >
< div class = "line" > < a id = "l00019" name = "l00019" > < / a > < span class = "lineno" > 19< / span > < span class = "keywordflow" > if< / span > (argc == 2)< / div >
< div class = "line" > < a id = "l00020" name = "l00020" > < / a > < span class = "lineno" > 20< / span > n = strtoull(argv[1], NULL, 10);< / div >
< div class = "line" > < a id = "l00021" name = "l00021" > < / a > < span class = "lineno" > 21< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a id = "l00022" name = "l00022" > < / a > < span class = "lineno" > 22< / span > {< / div >
< div class = "line" > < a id = "l00023" name = "l00023" > < / a > < span class = "lineno" > 23< / span > printf(< span class = "stringliteral" > " Enter starting number: " < / span > );< / div >
< div class = "line" > < a id = "l00024" name = "l00024" > < / a > < span class = "lineno" > 24< / span > scanf(< span class = "stringliteral" > " %lu" < / span > , & n); < span class = "comment" > // input number< / span > < / div >
< div class = "line" > < a id = "l00025" name = "l00025" > < / a > < span class = "lineno" > 25< / span > }< / div >
< div class = "line" > < a id = "l00026" name = "l00026" > < / a > < span class = "lineno" > 26< / span > < / div >
< div class = "line" > < a id = "l00027" name = "l00027" > < / a > < span class = "lineno" > 27< / span > curr_no = n; < span class = "comment" > // curr_no stores input number n< / span > < / div >
< div class = "line" > < a id = "l00028" name = "l00028" > < / a > < span class = "lineno" > 28< / span > < span class = "keywordflow" > while< / span > (curr_no != 1) < span class = "comment" > // loop till series reaches 1< / span > < / div >
< div class = "line" > < a id = "l00029" name = "l00029" > < / a > < span class = "lineno" > 29< / span > {< / div >
< div class = "line" > < a id = "l00030" name = "l00030" > < / a > < span class = "lineno" > 30< / span > num_steps++;< / div >
< div class = "line" > < a id = "l00031" name = "l00031" > < / a > < span class = "lineno" > 31< / span > printf(< span class = "stringliteral" > " %llu-> " < / span > , curr_no);< / div >
< div class = "line" > < a id = "l00032" name = "l00032" > < / a > < span class = "lineno" > 32< / span > < span class = "keywordflow" > if< / span > (curr_no % 2 == 0) < span class = "comment" > // condition for even number< / span > < / div >
< div class = "line" > < a id = "l00033" name = "l00033" > < / a > < span class = "lineno" > 33< / span > curr_no = curr_no / 2;< / div >
< div class = "line" > < a id = "l00034" name = "l00034" > < / a > < span class = "lineno" > 34< / span > < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a id = "l00035" name = "l00035" > < / a > < span class = "lineno" > 35< / span > curr_no = (curr_no * 3) + 1; < span class = "comment" > // condition for odd number< / span > < / div >
< div class = "line" > < a id = "l00036" name = "l00036" > < / a > < span class = "lineno" > 36< / span > }< / div >
< div class = "line" > < a id = "l00037" name = "l00037" > < / a > < span class = "lineno" > 37< / span > printf(< span class = "stringliteral" > " 1\nNumber of steps: %llu\n" < / span > , num_steps);< / div >
< div class = "line" > < a id = "l00038" name = "l00038" > < / a > < span class = "lineno" > 38< / span > < span class = "keywordflow" > return< / span > 0;< / div >
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