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C Programming Cheat Sheet - CSE240 Concepts

C Programming Cheat Sheet - CSE240 Concepts




C Programming Cheat Sheet

CSE240 Homework 4 Concepts & Patterns


🧠 Programming Methodology


The Three-Step Process



1. INSTRUCTION
Read what the homework says to do



2. TRANSLATION
Convert requirement to C syntax



3. WHY
Understand the reasoning behind the choice






Key Insight: Instruction order ≠ Implementation order. Always think about logical flow, not comment order.





⚡ Essential Function Design Pattern



int myFunction() {
// 1. VALIDATE INPUTS FIRST
if (somethingWrong) {
return errorCode;
}

// 2. PREPARE DATA
convertInputsToProperFormats();

// 3. PERFORM MAIN OPERATION
doTheActualWork();

// 4. CLEAN UP / ORGANIZE
sortOrOrganizeResults();

// 5. REPORT SUCCESS
return successCode;
}



Remember: Always validate before doing work. Check conditions BEFORE attempting operations.





📊 Structs & Arrays of Structs


Basic Struct Syntax


struct studentRecord {
char studentName[MAX_NAME_LENGTH];
char major[MAX_NAME_LENGTH];
schoolYear schoolYear;
unsigned int studentID;
};

// Create array of structs
struct studentRecord list[MAX_STUDENTS];



Accessing Struct Elements


// Access elements using dot notation
list[i].studentName
list[i].major
list[i].schoolYear
list[i].studentID

// Copy strings into struct
strcpy(list[count].studentName, studentName_input);

// Assign direct values
list[count].studentID = studentID_input;





🔢 Enums (Enumeration Types)



typedef enum {
freshman = 0,
sophomore,
junior,
senior
} schoolYear;



String to Enum Conversion


schoolYear yearEnum;
if (strcmp(schoolYear_input, "freshman") == 0) {
yearEnum = freshman;
}
else if (strcmp(schoolYear_input, "sophomore") == 0) {
yearEnum = sophomore;
}
// ... etc



Enum to String Conversion


switch (list[i].schoolYear) {
case freshman:
printf("freshman\n");
break;
case sophomore:
printf("sophomore\n");
break;
// ...…