- This operator performs two operations in a sequence, such as -
- First, an add operation.
- Next, the assignment of the result of an add operation.
Understanding the += operator with a code -
i=2; #initializing i to 2
i+=2; #equals to, i = i+2;
- Statement i+=2 is equal to i=i+2, hence 2 will be added to the value of i, which gives us 4.
- Finally, the result of addition, 4 is assigned back to i, updating its original value from 2 to 4.
A special case scenario for all the compound assigned operators
i=2;
i+=2*2; #equals to, i = i+[2*2];
In all the compound assignment operators, the expression on the right side of = is always calculated first and then the compound assignment operator will start its functioning. Hence in the last code, statement i+=2*2; is equal to i=i+[2*2], which results in i=i+4, and finally it returns 6 to i.
Example with += operator
# Example with += compound assignment operator in Python
str ="Hello";
print["Original string value : ", str]
str+="World!"
print["Updated string value : ", str]
i=10
print["Original integer value : ", i]
i+=10 # i = i+10
print["Updated integer value : ", i]
f=10.555
print["Original float value : ", f]
f+=20 # f = f+20
print["Updated float value : ", f]
Output is Original string value : Hello
Updated string value : HelloWorld!
Original integer value : 10
Updated integer value : 20
Original float value : 10.555
Updated float value : 30.555
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- This operator performs two operations in sequence -
- Subtraction operation.
- Assignment of the result of a subtract operation.
Understanding the -= operator with a code -
i=2;
i-=2;
- Statement i-=2 is equal to i=i-2, hence 2 will be subtracted from the value of i, which gives us 0.
- Finally, the result of subtraction i.e. 0 is assigned back to i, updating its value to 0.
Example with -= operator
# Example with -= compound assignment operator in Python
i=10
print["Original integer value : ", i]
i-=10 # i = i-10
print["Updated integer value : ", i]
f=10.555
print["Original float value : ", f]
f-=20 # f = f-20
print["Updated float value : ", f]
g=99.99
print["Original float value : ", g]
g-=19.99 # g = g-19.99
print["Updated float value : ", g]
Output is Original integer value : 10
Updated integer value : 0
Original float value : 10.555
Updated float value : -9.445
Original float value : 99.99
Updated float value : 80.0
- This operator performs two operations in sequence -
- Multiplication operation.
- Assignment of the result of a multiplication operation.
Understanding the *= operator with a code -
i=2; #initializing i to 2
i*=2;
- Statement i*=2 is equal to i=i*2, hence 2 will be multiplied with the value of i, which gives us 4.
- Finally, the result of multiplication, 4 is assigned back to i, updating its value to 4.
Example with *= operator
# Example with *= operator in C++
s=10
print["Original value : ", s]
s*=5+10 # s = s*[5+10]
print["Value after *=5+10 operation : ", s]
i=10
print["Original int : ", i]
i*=10.5 # i = i*10.5;
print["Value after *=10 operation : ", i]
l=100
print["Original int : ", l]
l*=1000 # l = l*1000;
print["Value after *=1000 operation : ", l]
f=10.5
print["Original float : ", f]
f*=20 # f = f*20;
print["Value after *=20 operation : ", f]
Output -
Original value : 10
Value after *=5+10 operation : 150
Original int : 10
Value after *=10 operation : 105.0
Original int : 100
Value after *=1000 operation : 100000
Original float : 10.5
Value after *=20 operation : 210.0
- This operator performs two operations in sequence -
- floating-point division operation.
- Assignment of the result of floating-point division operation.
Understanding the /= operator with a code -
i=4; #initializing i to 4
i/=2;
- Statement i/=2 is equal to i=i/2, hence 4 will be divided by the value of i, which gives us 2.0
- Finally, the result of division i.e. 2.0 is assigned back to i, updating its value from 4 to 2.0.
Example with /= operator
# Example with //= operator in Python
s=3;
print[ "Original value : ", s]
s//=5-2; # s = s//[5-2]
print[ "Value after //=5-2 operation : ", s]
i=10;
print[ "Original value : ", i]
i//=10; # i = i//10;
print[ "Value after //=10 operation : ", i]
l=999;
print[ "Original value : ", l]
l//=2; # l = l//2;
print[ "Value after //=2 operation : ", l]
f=80.5;
print["Original value : ", f]
f//=20; # f = f//20;
print["Value after //=20 operation : ", f]
d=44.5;
print["Original value : ", d]
d//=22; # d = d//22;
print["Value after //=22 operation : ", d]
Output-
Original value : 10
Value after /=5-2 operation : 3.3333333333333335
Original value : 10
Value after /=10 operation : 1.0
Original value : 999
Value after /=2 operation : 499.5
Original value : 80.5
Value after /=20 operation : 4.025
Original value : 44.5
Value after /=22 operation : 2.022727272727273
- This operator performs two operations in sequence -
- Integer division operation, which gives us an integer quotient value after dividing two integers and it gives a floating-point quotient after dividing a floating-point number with an integer value or vice versa.
- Assignment of the result of an integer division operation.
Understanding the //= operator with a code -
i=4; #initializing i to 4
i//=2;
- Statement i/=2 is equal to i=i//2, hence 4 will be divided by the value of i, which gives us 2.
- Finally, the result of division i.e. 2 is assigned back to i, updating its value from 4 to 2.
Example with //= operator
# Example with //= operator in C++
s=3;
print[ "Original value : ", s]
s//=5-2; # s = s//[5-2]
print[ "Value after //=5-2 operation : ", s]
i=10;
print[ "Original value : ", i]
i//=10; # i = i//10;
print[ "Value after //=10 operation : ", i]
l=999;
print[ "Original value : ", l]
l//=2; # l = l//2;
print[ "Value after //=2 operation : ", l]
f=80.5;
print["Original value : ", f]
f//=20; # f = f//20;
print["Value after //=20 operation : ", f]
d=44.5;
print["Original value : ", d]
d//=22; # d = d//22;
print["Value after //=22 operation : ", d]
Output-
Original value : 3
Value after //=5-2 operation : 1
Original value : 10
Value after //=10 operation : 1
Original value : 999
Value after //=2 operation : 499
Original value : 80.5
Value after //=20 operation : 4.0
Original value : 44.5
Value after //=22 operation : 2.0
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