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C Language > Learn C Language > Other than in a for statement, when is the comma operator...
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Other than in a for statement, when is the comma operator used?

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Example : int i,j; i=(10,20,30,40); j=10,20,30,40; printf("%d",i); printf("%d",j); // in this program output of i will be 40 and j will be 10 // In interviews you can face such type of comma operator related questions.
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Thanks for the question Sanjay, The comma operator is commonly used to separate variable declarations, function arguments and expressions. Thanks, Team DishaaPro www.dishaapro.com
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Professional Tutor with 15 years of experience.

Comma operator ( , ) is a binary operator. ------- USE ------- 1. for (first = s, s += len - 1; s >= first; --s) 2. ++p, ++q; 3. int a=1, b=2, c=3; 4. if (y = f(x), y > x) 5. if (failure) return (errno = EINVAL, -1); This can be written more verbosely as: if (failure) { errno =...
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Comma operator ( , ) is a binary operator. ------- USE ------- 1. for (first = s, s += len - 1; s >= first; --s) 2. ++p, ++q; 3. int a=1, b=2, c=3; 4. if (y = f(x), y > x) 5. if (failure) return (errno = EINVAL, -1); This can be written more verbosely as: if (failure) { errno = EINVAL; return -1; } 6. printf("Hello, %s!", "world"); 7. printf("Computer","Programming"); 8. void addition(n1,n2,ans); ....etc. read less
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Professional Trainer:: Hadoop Big Data, DevOps, Perl, Python

its used only when we use assignment int a=1, b=2, c=3; it has nothing to do with for statement, the assignment which you are doing in for, is where it uses comma.
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Comma operator can also be used in other statements like printf(), scanf() e.g printf("The number entered is %d", num); It can also be used for separating the variables while declaring e.g int num1, num2,num3; Separating the arguments during function declaration
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We also use comma for passing multiple arguments to a function.
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C/C++/SQL/Datastructures/Database/Excel

There are lot many places, printf, scanf, sequence of delaration, argument passing etc.
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While if variables declaratios etc
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International Corporate Trainer For dotnet Core ,Angular 2 ,C ,C++ and LPT Marathi for RBI Banking

comma operatoris used in enum data type declaration enum color={violet,indigo,blue, green}
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We don't use comma in for loop, we use semi-colon Apart from that semi-colon are used for terminating C commands
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