Can you return null in c?

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How can I implement opaque (abstract) data types in C? What's the difference between these two declarations? struct x1 { ... }; typedef struct { ... } x2;

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What is storage class?

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code for quick sort?

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Given an unsigned integer, find if the number is power of 2?

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Which one would you prefer - a macro or a function?

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Write a program to check palindrome number in c programming?

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What will be printed as the result of the operation below: #include<..> int x; int modifyvalue() { return(x+=10); } int changevalue(int x) { return(x+=1); } void main() { int x=10; x++; changevalue(x); x++; modifyvalue(); printf("First output:%d\n",x); x++; changevalue(x); printf("Second output:%d\n",x); modifyvalue(); printf("Third output:%d\n",x); }

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Do you know pointer in c?

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How to set a variable in the environment list?

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How do you list files in a directory?

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What are structure types in C?

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