Chapter2a
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The document discusses control transfer instructions in assembly language programming. It describes unconditional jumps that transfer control without regard for conditions, and conditional jumps that transfer control based on a truth value set in flags registers by a comparison instruction. Some examples of conditional jump instructions are JE for equality, JNE for inequality, JL/JNGE for less than, JLE/JNG for less than or equal, and others. The document shows how conditional jumps can be used to implement if statements by comparing values and branching to a label if the condition is true.
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Now check the powerpoint presentation about selection structures in programming. For more visit www.techora.net
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In this PPT slide, we discuss about the selection structure
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Here are the answers to the quiz questions:
1. In real mode addressing, the physical address is calculated by multiplying the segment by 10h and adding the offset. So for 1234:1001, the physical address would be 1234 * 10h + 1001 = 123C001h.
2. Given the registers and memory:
DI = 1234h
SI = 1236h
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Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
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Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
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1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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- 1. Group Activity Sample: scanf(“%c”,&x); mov eax, 3 mov ebx, 0 mov ecx, x int 80h
- 2. Group Activity 1. printf(“%c”,x); 2. sum = x + y; 3. prod = x * y; (assume x and y are byte-size variables)
- 3. Group Activity 1. printf(“%c”,x); mov eax, 4 mov ebx, 1 mov ecx, x mov edx, 1 int 80h
- 4. Group Activity 2. sum = x + y; mov bl, [x] add bl, [y] mov [sum], bl
- 5. Group Activity 3. prod = x * y; mov al, [x] mul byte[y] mov [prod], ax
- 6. Structured Assembly Language Programming Techniques Control Transfer Instructions
- 7. Objectives At the end of the discussion, the students should be able to: Implement selection statements in assembly Describe how unconditional jumps and conditional statements work
- 8. Control Transfer Instructions allows program control to transfer to specified label Unconditional or Conditional Unconditional – executed without regards to any situation or condition in the program – transfer of control goes from one code to another by force jmp label – unconditional jump
- 9. Control Transfer Instructions mov al, 5 next: add [num1],al mov eax, 4 jmp next mov ebx, 1 mov ecx, num2 mov eax, 4 mov edx, 1 mov ebx, 1 int 80h mov ecx, num1 mov edx, 1 int 80h (1) (2)
- 10. Control Transfer Instructions Conditional – a jump carried out on the basis of a truth value – the information on which such decisions are based is contained in the flags registers
- 11. Boolean Expressions evaluates to True or False compares two values cmp source1, source2 Source1 may be a register or memory Source2 may be a register, memory or immediate Operands cannot be both memory. Operands must be of the same size.
- 12. Conditional Jumps usually placed after a cmp instruction conditional_jump label JE – branches if source1 == source2 JNE – branches if source1 ≠ source2
- 13. Conditional Jumps Signed Conditional Jump – JL or JNGE branches if source1 < source2 – JLE or JNG branches if source1 ≤ source2 – JG or JNLE branches if source1 > source2 – JGE or JNL branches if source1 ≥ source2
- 14. Conditional Jumps Unsigned Conditional Jumps – JB or JNAE branches if source1 < source2 – JBE or JNA branches if source1 ≤ source2 – JA or JNBE branches if source1 > source2 – JAE or JNB branches if source1 ≥ source2
- 15. Control Structure: IF Statement if (boolean) cmp AX, CX {statements;} jg if_statement jmp next_statement if(AX>CX){ BX = DX + 2; if_statement: } add DX, 2 mov BX, DX next_statement: ...