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1CCCCC1.1.hello, worldC“hello, world#include stdio.hmain(){ printf(hello, world\n);}UNIX“.chello.ccc hello.ca.outa.outa.outhello, world#include stdio.hmain(){ printf(hello, world\n);}mainmainmainprintf\nCCCFortranPascalmainmain——mainmainmain#include stdio.hC7Bmain(){}mainprintf(hello, world\n);hello,world\nprintfprintfhello, world\nprintfC\n\nprintf\n\nprintf(hello, world);Cprintf#include stdio.hmain(){ printf(hello, ); printf(world); printf(\n);}\n\nC\t\b\\\2.311“hello, world12printf\cc1.2.=(5/9)(32)11720640460158026100371204814060160711808220093220104240115260126280137300148main“hello, world#include stdio.h/*fahr=020…300 */main(){ int fahr, celsius; int lower, upper, step; lower = 0; /* */ upper = 300; /* */ step = 20; /* */ fahr = lower; while (fahr = upper) { celsius = 5 * (fahr32) / 9; printf(%d\t%d\n, fahr, celsius); fahr = fahr + step; }}/*fahr=020…300 *//**/C int fahr, celsius; int lower, upper, step;intfloatintfloatint16327683276732intfloat32610381038intfloatCchar——shortlongdouble4 lower = 0; upper = 300; step = 20; fahr = lower;while while (fahr = upper) { ... }while(fahr=upper)3(fahrupper)whilewhile while (i j) i = 2 * i;whileCcelsius = 5 * (fahr 32) / 9celsius595 / 9C595 / 900printfprintf7%……%dprintf( %d\t%d\n, fahr, celsius);fahrcelsius\tprintf%……printfCCprintfCANSIprintfC777.4scanfscanfprintfprintf%dprintf( %3d %6d\n, fahr, celsius);fahrcelsiusfahr3celsius6 0 17 20 6 40 4 60 15 80 26 100 37 ...017.817 #include stdio.h /* print FahrenheitCelsius table for fahr = 0, 20, ..., 300; floatingpoint version */ main() { float fahr, celsius; float lower, upper, step; lower = 0; /* lower limit of temperatuire scale */ upper = 300; /* upper limit */ step = 20; /* step size */ fahr = lower; while (fahr = upper) { celsius = (5.0/9.0) * (fahr32.0); printf(%3.0f %6.1f\n, fahr, celsius); fahr = fahr + step; } }fahrcelsiusfloat5 / 905.0 / 9.0fahr– 32322fahr = lower;while (fahr = upper)intfloatprintf%3.0ffahr3%6.1fcelsius61 0 17.8 20 6.7 40 4.4 ...%6f6%.2f%f%d%6d6%f%6f6%.2f%6.2f6printf%o%x%c%s%%%13141.3. for #include stdio.h /*—*/ main() { int fahr; for (fahr = 0; fahr = 300; fahr = fahr + 20) printf(%3d %6.1f\n, fahr, (5.0/9.0)*(fahr32)); }intfahrforprintfCprintf%6.1fforwhileforwhilefor3fahr = 0fahr = 300trueprintffahr = fahr + 20fahrfaisewhileforwhi1eforforwhile1530001.4.30020#define#define#define #include stdio.h #define LOWER 0 /* lower limit of table */ #define UPPER 300 /* upper limit */ #define STEP 20 /* step size */ /* print FahrenheitCelsius table */ main() { int fahr; for (fahr = LOWER; fahr = UPPER; fahr = fahr + STEP) printf(%3d %6.1f\n, fahr, (5.0/9.0)*(fahr32)); }LOWERUPPERSTEP#define1.5.0Cgetcharputchargetcharc = getchar()c7putcharputchar()cputcharprintf1.5.1.getcharputcharwhile ()C #include stdio.h /* copy input to output; 1st version */ main() { int c; c = getchar(); while (c != EOF) { putchar(c); c = getchar(); } }!=charintintCgetcharEOFend of filecgetcharccharEOFcintEOFstdio.hcharCCc = getchar()cwhile #include stdio.h /* copy input to output; 2nd version */ main() { int c; while ((c = getchar()) != EOF) putchar(c); }whilecwhilewhilewhilemaingetcharwhile!==!==c = getchar() != EOFc = (getchar() != EOF)c01getchar216getchar() != EOF0117EOF1.5.2. #include stdio.h /* count characters in input; 1st version */ main() { long nc; nc = 0; while (getchar() != EOF) ++nc; printf(%ld\n, nc); }++nc;++1nc = nc + 1++nc++++ncnc++2++ncnc++nc1longintlong32intlongint1632767int%ldprintflongdoublewhilefor #include stdio.h /* count characters in input; 2nd version */ main() { double nc; for (nc = 0; gechar() != EOF; ++nc) ; printf(%.0f\n, nc); }floatdoubleprintf%f%.0f0forCforforgetcharwhilefor0whi1efor0whilefor1.5.3. #include stdio.h /* count lines in input */ main() { int c, nl; nl = 0; while ((c = getchar()) != EOF) if (c == '\n') ++nl; printf(%d\n, nl); }whileif++nlif==CPascal=Fortran.EQ.C=====C=2'A'ASCII65A65'A'65'A''\n'ASCII10'\n'\n21819110\t\b\\1.5.4.4UNIXwc #include stdio.h #define IN 1 /* inside a word */ #define OUT 0 /* outside a word */ /* count lines, words, and characters in input */ main() { int c, nl, nw, nc, state; state = OUT; nl = nw = nc = 0; while ((c = getchar()) != EOF) { ++nc; if (c == '\n') ++nl; if (c == ' ' || c == '\n' || c = '\t') state = OUT; else if (state == OUT)
本文标题:the c programing language
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