base conversion

[kenez]

Guys I need to write a program that will convert FROM and TO any bases ranging from 2 to 10.oh bases meaning binary, base 3 numbers, octal etc(up to 10)

The program should prompt for the base “converted to” and the base “converted from”.

Can somebody tell me how I need to go about this and what aspects of C
maybe helpful. I will do the actual coding and report any problems.
Thanks

[yeswanth]

A program to convert a decimal number to its equivalent binary number.

#include <stdio.h><br /> #include <conio.h><br /> void main()<br /> {<br /> unsigned long dec;<br /> int a[25],c=0,i;<br /> clrscr();<br /> printf("nENTER A DECIMAL NUMBER: ");<br /> scanf("%lu",&#038;dec);<br /> printf("n%lu IN BINARY FORMAT: ",dec);<br /> while(dec>0)<br /> {<br /> a[c]=dec%2;<br /> dec=dec/2;<br /> c++;<br /> }<br /> for(i=c-1;i>=0;i--)<br /> printf("%d",a);<br /> getch();<br /> }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

#include <stdio.h><br /> #include <conio.h><br /> void main()<br /> {<br /> unsigned long dec;<br /> int a[25],c=0,i;<br /> clrscr();<br /> printf("nENTER A DECIMAL NUMBER: ");<br /> scanf("%lu",&#038;dec);<br /> printf("n%lu IN BINARY FORMAT: ",dec);<br /> while(dec>0)<br /> {<br /> a[c]=dec%2;<br /> dec=dec/2;<br /> c++;<br /> }<br /> for(i=c-1;i>=0;i--)<br /> printf("%d",a);<br /> getch();<br /> }

[Priyansh Agrawal]

This code could do this from base 2-10 to base 2-10. There is a nice function called itoa that converts int to char* and you can specify the base. Unfortunatelly the function atoi has no base-parameter. So I recoded it:

#include <stdio.h><br /> #include <stdlib.h><br /> int xy(int x,int y)<br /> {<br /> int r=1,i;<br /> <br /> for (i=0;i<y;i++)<br /> {<br />     r*=x;<br /> }<br /> <br /> return r;<br /> }<br /> <br /> int my_atoi(char *s,int base)<br /> {<br /> int r=0,i,j,pos=0;<br /> <br /> for (j=0;j&lt;80 &#038;&#038; s[j]!=0 &#038;&#038; s[j]>='0' &#038;& s[j]<='9';j++);<br /> <br /> for (i=j-1;i>=0;i--)<br /> {<br />     r+=(s-'0')*xy(base,pos);<br />     pos++;<br /> }<br /> <br /> return r;<br /> }<br /> <br /> int main()<br /> {<br /> char buff[83];<br /> int num,b1,b2;<br /> <br /> printf("from base:");<br /> fgets(buff,80,stdin);<br /> b1=atoi(buff);<br /> <br /> printf(" to base:");<br /> fgets(buff,80,stdin);<br /> b2=atoi(buff);<br /> <br /> printf("Number:");<br /> fgets(buff,80,stdin);<br /> num=my_atoi(buff,b1);<br /> <br /> itoa(num,buff,b2);<br /> <br /> printf("nresult is %sn",buff);<br /> <br /> return 0;<br /> }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

#include <stdio.h><br /> #include <stdlib.h><br /> int xy(int x,int y)<br /> {<br /> int r=1,i;<br /> <br /> for (i=0;i<y;i++)<br /> {<br />     r*=x;<br /> }<br /> <br /> return r;<br /> }<br /> <br /> int my_atoi(char *s,int base)<br /> {<br /> int r=0,i,j,pos=0;<br /> <br /> for (j=0;j&lt;80 &#038;&#038; s[j]!=0 &#038;&#038; s[j]>='0' &#038;& s[j]<='9';j++);<br /> <br /> for (i=j-1;i>=0;i--)<br /> {<br />     r+=(s-'0')*xy(base,pos);<br />     pos++;<br /> }<br /> <br /> return r;<br /> }<br /> <br /> int main()<br /> {<br /> char buff[83];<br /> int num,b1,b2;<br /> <br /> printf("from base:");<br /> fgets(buff,80,stdin);<br /> b1=atoi(buff);<br /> <br /> printf("  to base:");<br /> fgets(buff,80,stdin);<br /> b2=atoi(buff);<br /> <br /> printf("Number:");<br /> fgets(buff,80,stdin);<br /> num=my_atoi(buff,b1);<br /> <br /> itoa(num,buff,b2);<br /> <br /> printf("nresult is %sn",buff);<br /> <br /> return 0;<br /> }

[Author]

Posts