A do while loop is similar to while loop with one exception that it executes the statements inside the body of do-while before checking the condition. On the other hand in the while loop, first the condition is checked and then the statements in while loop are executed. So you can say that if a … Read more
A loop is used for executing a block of statements repeatedly until a given condition returns false. In the previous tutorial we learned for loop. In this post we will learn while loop in C. while loop Syntax of while loop: while (condition test) { //Statements to be executed repeatedly // Increment (++) or Decrement … Read more
A loop is used for executing a block of statements repeatedly until a given condition returns false. C For loop This is one of the most frequently used loop in C programming. Syntax of for loop: for (initialization; condition test; increment or decrement) { //Statements to be executed repeatedly } Flow Diagram of For loop … Read more
A example in BASH is as follows to display welcome message 5 times with for loop. #!/bin/bash for i in 1 2 3 4 5 do echo “Welcome $i times” done
Linux shell script – for loop using ranges or counting The for loop can be set using the numerical range. The range is specified by a beginning and ending number. The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to … Read more
Shell Script Example – Linux for ((j=12;j<=31;j++)); do echo $j year=2020 month=01 day=$j mkdir /mnt/recording/final/11/$year-$month-$day results=($(mysql –user name -ppassword -h 192.168.2.4 db -Bse “SELECT id FROM calldetails WHERE calldate BETWEEN ‘$year-$month-$day 00:00:00’ AND ‘$year-$month-$day 23:00:00′”)) cnt=${#results[@]} for (( i=0 ; i<cnt ; i++ )) do a=${results[$i]} echo auid=$a; cp /home/data/$year-$month-$day/$a.gsm /mnt/recording/final/11/$year-$month-$day/$a.gsm done done
Shell Script : Nested for loop statement Nested for loops means loop within loop. They are useful for when you want to repeat something serveral times for several things. For example, create a shell script called nestedforloop.sh: #!/bin/bash # A shell script to print each number five times. for (( i = 1; i <= … Read more
C If else statement Syntax of if else statement: If condition returns true then the statements inside the body of “if” are executed and the statements inside body of “else” are skipped. If condition returns false then the statements inside the body of “if” are skipped and the statements in “else” are executed. if(condition) { … Read more
When we need to execute a block of statements only when a given condition is true then we use if statement. In the next tutorial, we will learn C if..else, nested if..else and else..if. C – If statement Syntax of if statement: The statements inside the body of “if” only execute if the given condition … Read more
Operator Precedence in C Operator precedence determines which operator is evaluated first when an expression has more than one operators. For example 100-2*30 would yield 40, because it is evaluated as 100 – (2*30) and not (100-2)*30. The reason is that multiplication * has higher precedence than subtraction(-). Associativity in C Associativity is used when … Read more