c語言大學(xué)教程課件

1、c語言大學(xué)教程1計算機科學(xué)與技術(shù)系計算機科學(xué)與技術(shù)系2022-3-62/612022-3-63/612022-3-64/612022-3-65/612022-3-66/612022-3-67/612022-3-68/612022-3-69/612022-3-610/612022-3-611/612022-3-612/612022-3-613/61Start/EndProcessInput/OutputTestConnectorFlow of activities2022-3-614/612022-3-615/61 2022-3-616/61 2022-3-617/61main() scanf(

2、%d, &quantity); scanf(%d, &pricePerkg); price = quantity*pricePerkg; printf(%d, price); 2022-3-618/61main() int quantity,price_per_kg,price; scanf(%d, &quantity); scanf(%d, &pricePerkg); price = quantity*pricePerkg; printf(%d, price); 2022-3-619/61main() int quantity,price_per_kg,pri

3、ce; scanf(%d, &quantity); scanf(%d, &pricePerkg); price = quantity*pricePerkg; printf(%d, price); 2022-3-620/612022-3-621/61NS圖2022-3-622/61計算兩個數(shù)中的最小者計算兩個數(shù)中的最小者. 2022-3-623/61ABNYNS圖圖傳統(tǒng)流程圖傳統(tǒng)流程圖2022-3-624/61 2022-3-625/61 2022-3-626/61main() int num1, num2, min; scanf(%d%d, &num1, &nu

4、m2); if (num1 num2) min =num1; else min = num2; printf(%d, min); 2022-3-627/612022-3-628/61step aif startstep mstep nend_ifstep b2022-3-629/61Syntax:復(fù)合語句復(fù)合語句compound statement被當(dāng)作一條語句看待被當(dāng)作一條語句看待2022-3-630/61Syntax:2022-3-631/61Single Selection Pseudocode :if startstep 1step 2step kend_if Statement:if

5、 (expression) statement 1statement 2statement k2022-3-632/61main() int num1, num2, min; printf(“Input 2 numbers: “); scanf(“%d%d”, &num1, &num2); min = num1; if (num1 num2)min = num2; printf(“Smallest: %dn”, min);Input 2 numbers: _num2?num1?min?Input 2 numbers: 20 15_20152015Input 2 numbers:

6、 20 15Smallest: 15_2022-3-633/61Example:main() int mark;scanf(“%d”, &mark);if (mark = 60)printf(“Passn”);printf(“Your mark is %d”, mark);2022-3-634/61Example:main() int mark;scanf(“%d”, &mark);if (mark = 60)printf(“Passn”);printf(“Your mark is %d”, mark);2022-3-635/61Step aif startStep mStep

7、 nend_ifelse startStep xStep yend_elseStep z2022-3-636/61Syntax:oror2022-3-637/61Double Selection Pseudocode:if startstep 1step kend_ifelse startstep 1step nend_else Statement:if (expression) statement 1statement kelse statement 1statement n2022-3-638/61Example:if (num1 num2)min = num1;elsemin = num

8、2;printf(“Smallest: %dn”, min);num215num1min?_10Smallest: 10_2022-3-639/61Example:if (num1 num2)min = num1;elsemin = num2;printf(“Smallest: %dn”, min);num215num1min?_15Smallest: 15_2022-3-640/61if (num1 num2) min = num1;max = num2;else min = num2;max = num1;printf(“Min = %d, Max = %dn”, min, max);nu

9、m2125num1700min?_max?Min = 125, Max = 700_1257002022-3-641/61if (num1 num2)min = num1;elsemin = num2;printf(“Smallest: %dn”, min);min = num1 num2 num1 num2;printf(“Smallest: %dn”, min);2022-3-642/612022-3-643/61step aif (expression) step mstep nstep b2022-3-644/61step aif startstep mstep nend_ifstep

10、 bstep aif (expression) step mstep nelse step xstep ystep bGuesshow does multiple selection look like ?2022-3-645/61Step a (expression1)Step m (expression2) Step n Step z2022-3-646/61Step a(expression1) Step m (expression2) Step n Step x Step z2022-3-647/61Step a(表達式表達式1) Step 1 (表達式表達式2) Step 2 (表達

11、式表達式3) Step 3 () Step Step n Step zexpr1step 1非0=0expr2expr3Step nStep 3Step 2非0非0=0=0Step aStep z2022-3-648/612022-3-649/61當(dāng)當(dāng)t 18時，為低體重；時，為低體重；當(dāng)當(dāng)18 t 25時，為正常體重；時，為正常體重；當(dāng)當(dāng)25 t 27時，為超重體重；時，為超重體重；當(dāng)當(dāng)t 27時，為肥胖。時，為肥胖。2022-3-650/61當(dāng)當(dāng)t 18時，為低體重；時，為低體重；當(dāng)當(dāng)18 t 25時，為正常體重；時，為正常體重；當(dāng)當(dāng)25 t 27時，為超重體重；時，為超重體重；當(dāng)當(dāng)t 2

12、7時，為肥胖。時，為肥胖。2022-3-651/61 (p1) (p2) A B(p4) C D (p1) A(p2) C D (p1) (p2) A BC (p1) (p2) A(p4) C D (p1) (p2) AC else與哪個與哪個if配套？配套？2022-3-652/61The structure is similar to multiple selection (flowchart)2022-3-653/61Important Rule !2022-3-654/61Example: switch (month) case 1:printf(“Januaryn”);break;c

13、ase 2:printf(“Februaryn”);break;case 3:printf(“Marchn”);break;default:printf(“Othersn”);break; printf(“End”);January_JanuaryEnd _2022-3-655/61Example: switch (month) case 1:printf(“Januaryn”);break;case 2:printf(“Februaryn”);break;case 3:printf(“Marchn”);break;default:printf(“Othersn”);break; printf

14、(“End”);March_MarchEnd _2022-3-656/61Example: switch (month) case 1:printf(“Januaryn”);break;case 2:printf(“Februaryn”);break;case 3:printf(“Marchn”);break;default:printf(“Othersn”);break; printf(“End”);2022-3-657/61Example: switch (month) case 1:printf(“Januaryn”);break;case 2:printf(“Februaryn”);c

15、ase 3:printf(“Marchn”);break;default:printf(“Othersn”);break; printf(“End”);2022-3-658/61Example: switch (month) case 1:printf(“Januaryn”);break;case 2:printf(“Februaryn”);case 3:printf(“Marchn”);break;default:printf(“Othersn”);break; printf(“End”);February_ March _ End _2022-3-659/61Example: switch (month) case 1:printf(“Januaryn”);break;case 2:printf(“Februaryn”);case 3:printf(“Marchn”);break;default:printf(“