input/output exercise

exercises/input_output/Makefile

+LDLIBS = -lm
+CFLAGS = -O -Wall -std=gnu11
+
+default: cmdline stdin file
+
+.PHONEY: clean
+clean:
+	$(RM) cmdline stdin file out.txt
+
+

exercises/input_output/cmdline.c

+#include<stdio.h>
+#include<math.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv) {
+	for(int i=1;i<argc;i++) {
+		double x = atof(argv[i]);
+		printf("x=%g, sin(x)=%g, cos(x)=%g\n",x,sin(x),cos(x))	;
+	}
+return 0;
+}
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exercises/input_output/file.c

+#include<stdio.h>
+#include<math.h>
+#include <stdlib.h>
+
+int main(int argc, char** argv) {
+	FILE* in_stream=fopen(argv[1],"r");
+	FILE* out_stream=fopen(argv[2],"w");
+	int i=0;
+	while(1){
+		double x;
+		i=fscanf(in_stream,"%lg",&x);
+		if(i!=EOF) {
+			fprintf(out_stream,"%s%g%10s%g\n","x=",x,"cos(x)=",cos(x));
+		}
+		else{break;}
+	}
+	fclose(in_stream);
+	fclose(out_stream);
+return 0;
+}
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exercises/input_output/input.txt

+1
+2
+3
+4
+5
+6
+7
+8
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exercises/input_output/stdin.c

+#include<stdio.h>
+#include<math.h>
+
+int main() {
+	int i=0;
+	while(1){
+		double x;
+		i=fscanf(stdin,"%lg",&x);
+		if(i!=EOF) {
+			fprintf(stdout,"x=%g, sin(x)=%g, cos(x)=%g\n",x,sin(x),cos(x));
+		}
+		else {break;}
+	}
+return 0;
+}
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