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bitwise operations in C
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Hello 
i need to write a program which gets from user number and index
( 0 <= number <= 255 , 0<=index<=7) .
then to add up to the number in bitwise a 1 in the place of the index :
if number is 102 which is 01100110
and index is 4 which is 01110110
and get 118 as a result.
for some reason it doesnt do that ..... i have no idea why , i used OR operation between numbers ..... :rolleyes:
Code added
thanx , Yotam
i need to write a program which gets from user number and index
( 0 <= number <= 255 , 0<=index<=7) .
then to add up to the number in bitwise a 1 in the place of the index :
if number is 102 which is 01100110
and index is 4 which is 01110110
and get 118 as a result.
for some reason it doesnt do that ..... i have no idea why , i used OR operation between numbers ..... :rolleyes:
Code added
thanx , Yotam
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Join Date: Apr 2004
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102 (decimal) = 1100110 (binary)
1 left shifted 4 is 10000 (binary) If I understand you.
1 left shifted 4 is 10000 (binary)
C Syntax (Toggle Plain Text)
#include <stdio.h>
int main(void)
{
int number = 102, index = 4;
number += 1 << index;
printf("number = %d\n", number);
return 0;
}
/* my output
number = 118
*/ "One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Join Date: Apr 2004
Posts: 4,306
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Solved Threads: 227
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Join Date: Feb 2006
Posts: 482
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C Syntax (Toggle Plain Text)
00100000 - The code would give your expected result without that. |
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