Control Statements in C - C Programming - Lecture Slides, Slides of Computer Science

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Control Statements in C

C Keywords

auto double int struct break else long switch case enum register typedef char extern return union const float short unsigned continue for signed void default goto sizeof volatile do if static while

The words in bold print are used in control statements. They change the otherwise sequential execution of the assignment statements in a function block

block of statements

const int MAX_BINS = 11; int orderNumber; int binNumber;

printf("Enter order number: "); scanf("%d", &orderNumber); binNumber = orderNumber % MAX_BINS; printf("Bin number is %d\n", binNumber); }

simple “if” statement

if (aNumber != 1000) countA++;

“if” – “else” with a block of

statements

if (aValue <= 10) { printf("Answer is %8.2f\n", aValue); countB++; } // End if else { printf("Error occurred\n"); countC++; } // End else

nested “if” statement

if (aValue == 1) countA++; else if (aValue == 10) countB++; else if (aValue == 100) countC++; else countD++;

“while” with a block of statements

while (aResult >= 1000) { aResult = aResult / aValue; printf("Result is %9.4f\n", aResult); } // End while

“while” with nested “if” statements

aResult = MAX_VALUE;

while (aResult >= 1000) { countW++;

// nested if statement if (aValue == 1) countA++; else if (aValue == 10) countB++; else if (aValue == 100) countC++; else countD++; aResult = aResult / aValue; } // End while

“for” with a single statement

for (i = 1; i <= MAX_LENGTH; i++) printf("#");

“for” with a block of statements

for (i = 0; i < MAX_SIZE; i++) { printf("Symbol is %c\n", aBuffer[i]); if (i > 0) aResult = aResult / i; } // End for

“switch” statement

switch (aNumber) { case 1 : countA++; break; case 10 : countB++; break; case 100 : case 500 : countC++; break; default : countD++; } // End switch