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Lecture++: Review 10/29/2012

Lecture++: Review 10/29/2012. About Midterm Exam. Hold on 11/05 Few programming exercises at the class Have only web access to the course slides Bring other documents is not allowed. Data Type. int unsigned int long long int float double long double char. Input and Output. Format

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Lecture++: Review 10/29/2012

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  1. Lecture++: Review10/29/2012

  2. About Midterm Exam • Hold on 11/05 • Few programming exercises at the class • Have only web access to the course slides • Bring other documents is not allowed

  3. DataType • int • unsignedint • longlongint • float • double • longdouble • char

  4. Input and Output • Format • %d, %lld, %u, %llu, %f, %lf, %c, %s • scanf(format, &arg1, &arg2, …); • printf(format, arg1, arg2, …); • gets(string); • puts(string); • getchar(); • putchar(char);

  5. Control Flow • Condition • &&, ||, !, ==, !=, >, <, >=, <= • if, else if, else • switch, case, default • for(<exp1>;<condition>;<exp2>){<statement>} • while(<condition>){<statement>} • do{<statement>}while(<condition>) • break, continue

  6. Function • Functionname • Listofparameters • Statement • Returntype

  7. Recursion • A function is recursive if it calls itself.

  8. Array • <Type> array_name[<Size>]; • Collection of same type elements • Constant size • Zero-based • Multidimensional array • int multi_array[n][m];

  9. Pointer • Declaration • Addressing operator (&) • Dereferencing operator (*) • Pointers and arrays are closely related • a[0] is the same as *a • a[1] is the same as *(a + 1)

  10. VariableScope • Globalvariable • Localvariable

  11. Memory • Heap • Stack • malloc(size) • free(address)

  12. CommonBugs -Typo • scanf(“%d”,n); • chars[10];scanf(“%c”,s); • charc=“a”; • if(a=1) • if(0<a<10) • if(a==b&b==c) • for(i=1;1<=n;i++) • while(i<10);i++;

  13. CommonBugs-Memory • Indexrangeofarray[n]isfrom0ton-1 • Usepointerwithoutmalloc() • Forgetting‘\0’intheendofstring • Callingfree()forthesameaddresstwice • Queryahugesizeofmemory

  14. CommonBugs-Others • Misunderstanding the problem • Uninitialized variable • Exceeding the range of int • Zerodivision • Forgettingtoputabreakinaswitch • Comparingstringswith“==”

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