Can You Use 2 or More or Conditions in an If Statement

can you have two conditions in an if statement

You can use logical operators to combine your boolean expressions.

• && is a logical and (both conditions need to be true)
• || is a logical or (at least one condition needs to be true)
• ^ is a xor (exactly one condition needs to be true)
• (== compares objects by identity)

For example:

if (firstCondition && (secondCondition || thirdCondition)) {
    ...
}

There are also bitwise operators:

• & is a bitwise and
• | is a bitwise or
• ^ is a xor

They are mainly used when operating with bits and bytes. However there is another difference, let's take again a look at this expression:

firstCondition && (secondCondition || thirdCondition)

If you use the logical operators and firstCondition evaluates to false then Java will not compute the second or third condition as the result of the whole logical expression is already known to be false. However if you use the bitwise operators then Java will not stop and continue computing everything:

firstCondition & (secondCondition | thirdCondition)

multiple conditions in same if statement in C

hi try this hope its work

#include<stdio.h>
#include<cono.h>
#include<iostream.h>
#include<stdlib.h>
void main(void)
{
 int a,b;
 printf("enter a");
 scanf("%d",&a);
 printf("enter b");
 scanf("%d",&b);
 if(a==1 && b<=8)
 {
  printf("you");
  exit(0);
  } else if(a==2 && 5<b && b<=10)
 {
  printf("you");
 }
else{
  printf("me");
  }
  getch();
  }

Can you use 2 or more OR conditions in an if statement?

You need to code your tests differently:

if (number==1 || number==2 || number==3) {
    cout << "Your number was 1, 2, or 3." << endl;
}
else if (number==4 || number==5 || number==6) {
    cout << "Your number was 4, 5, or 6." << endl;
}
else {
    cout << "Your number was above 6." << endl;
}

The way you were doing it, the first condition was being interpreted as if it were written like this

if ( (number == 1) || 2 || 3 ) {

The logical or operator (||) is defined to evaluate to a true value if the left side is true or if the left side is false and the right side is true. Since 2 is a true value (as is 3), the expression evaluates to true regardless of the value of number.

Is better if statements with multiple conditions or more else if statements?

Let's make a simple experiment !

Dummy data

data <- data.frame(numerator = sample(c(0:9, NA), 10000, replace = T),
                   denominator = sample(c(0:9, NA), 10000, replace = T))

Two functions made up of two " if " conditions

f1 <- function(x){
  num <- x[1] ; denom <- x[2]
  if (is.na(num)){
    result = 0
  }  else if (num == 0){
    result = 0
  }  else if (is.na(denom)){
    result = Inf
  }  else if (denom == 0){
    result = Inf
  }  else {
    result = num / denom
  }
  return(result)
}

f2 <- function(x){
  num <- x[1] ; denom <- x[2]
  if (is.na(num) || num == 0){
    result = 0
  }  else if (is.na(denom) || denom == 0){
    result = Inf
  }  else {
    result = num / denom
  }
  return(result)
}

Benchmark analysis

library(microbenchmark)
library(ggplot2)

res <- microbenchmark(
  type1 = {
    quotient1 <- apply(data, 1, f1)
  }, type2 = {
    quotient2 <- apply(data, 1, f2)
  }, times = 100
)

res
# Unit: milliseconds
#  expr      min       lq     mean   median       uq       max
# type1 21.91925 23.70445 27.16314 25.52339 26.90110 122.91710
# type2 22.00139 23.64297 26.11080 25.04576 26.46136  42.62506

autoplot(res)

Conclusion

You can try the benchmark several times and you can find that
there is no significant difference between two if conditions.

How to have multiple conditions for one if statement in python

I would use

def example(arg1, arg2, arg3):
     if arg1 == 1 and arg2 == 2 and arg3 == 3:
          print("Example Text")

The and operator is identical to the logic gate with the same name; it will return 1 if and only if all of the inputs are 1. You can also use or operator if you want that logic gate.

EDIT: Actually, the code provided in your post works fine with me. I don't see any problems with that. I think that this might be a problem with your Python, not the actual language.

What is better: multiple if statements or one if with multiple conditions?

One golden rule I follow is to "Avoid Nesting" as much as I can. But if it is at the cost of making my single if condition too complex, I don't mind nesting it out.

Besides you're using the short-circuit && operator. So if the boolean is false, it won't even try matching!

So,

if (boolean_condition && matcher.find(string)) {
    ...
}

is the way to go!

How to specify multiple conditions in an if statement in JavaScript

just add them within the main bracket of the if statement like

if ((Type == 2 && PageCount == 0) || (Type == 2 && PageCount == '')) {
            PageCount= document.getElementById('<%=hfPageCount.ClientID %>').value;
}

Logically this can be rewritten in a better way too! This has exactly the same meaning

if (Type == 2 && (PageCount == 0 || PageCount == '')) {

If Statement with Multiple Conditions vs Individual If Statements

They are equivalent. The || operator short-circuits, so as soon as it reaches a condition that is true, it stops checking other conditions and returns true.

The | operator does not short-circuit, so it would evaluate every operand before returning a value.

Same goes for && and & but with false. As soon as a false condition is reached, the && operator returns false.

So your two methods are functionally identical. Use whichever one you think is the cleanest, easiest to infer intent, etc.

Or does the compiler optimize the code to work most efficient no matter how the source is written?

Well, the optimizer can make changes to code for efficiency, but it cannot change the functional behavior, meaning it won't change the order of the operations. Imagine you had something like:

if ((x == 0) || (y/x > 1))

this is a common way to prevent divide-by-zero errors. If the compiler could rearrange the operands, then it could introduce divide-by-zero errors.

multiple conditions in while/if statement that runs if ANY of the conditions are true?

Yes, you can use the OR logic operator.

Example:

if(x==1 || x==2 || z==4)
{
    //code
}

the code will be executed when atleast one of the conditions in the if statement is true

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