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What is the use of 'pragma' in C language?
The #pragma directive is a compiler specific instruction. There are many things you can tell the compiler. For instance, the #pragma pack n directive tells the compiler to override the /Zpn command line argument and to use a new default structure packing value. To see all of the possible #pragma directives, go to online help, and index by #pragma directives, C/C++. You probably only need to type in #pra and then click on C/C++ to get this far.
What to do when the shift plus 2 gives the wrong sign instead of the at sign?
Change your keyboard configuration to US layout.
How do you write in c plus plus a series of n integers alternating plus and minus?
An array or vector of int or double or any other signed type can achieve this. If the array must alternate, then simply traverse the array alternating the signs as you go: std::vector<int> v = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; bool sign=true; // true is positive. for (int i=0; i<9; ++i) { if (sign) { // value must be positive if (v[i]<0) v[i] *= -1; // if negative, make positive } else { // value must be negative if (0<v[i]) v[i] *= -1; // if positive, make negative } sign = !sign; // switch sign for next iteration }
What is plus operator is it unary or binary?
There is no unary plus in C, but if there were, it would have only one operand, unlike the binary plus which has two: x = a + b; /* binary plus */ x = + b; /* unary plus -- not in C*/ x = a - b; /* unary plus */ x = - b; /* unary minus */
What character does every tag in HTML start with?
Every HTML tag starts with a less-than sign, as shown below.
