Get Parameters with C: Difference between revisions
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FILE * input = fopen(filename,'r'); | FILE * input = fopen(filename,'r'); | ||
process(input); | process(input); | ||
fclose(filename); | |||
} | } | ||
return 0; | return 0; | ||
} | } | ||
</source> | </source> |
Revision as of 22:26, 12 November 2012
Get parameters
- interactive approach:
<source lang="c">
- include "stdio.h"
int main() {
char * c; int i = 0; double d = 0.0;
printf("Enter a word\n"); scanf("%s",c); printf("Enter an integer\n"); scanf("%d",&i); printf("Enter a double\n"); scanf("%lf",&d); printf("You gave : %s %d %lf",c,i,d); printf("\n");
return 0;
} </source>
- from the command line:
<source lang="c">
- include "stdio.h"
int main(int argc, char* argv[]) {
if(argc != 4) { printf("\tUsage:\t"); printf("%s",argv[0]); printf(" <char> <integer> <double>\n"); } else { char * c = argv[1]; int i = atoi(argv[2]); double d = atof(argv[3]); printf("You gave : %s %d %lf",c,i,d); printf("\n"); } return 0;
} </source>
- from a file, considering that you have a defined routine process() to do the job
<source lang="c">
- include "stdio.h"
void process(FILE * file) { ...fscanf(...)... }
int main(int argc, char* argv[]) {
if(argc != 2) { printf("\tUsage:\t"); printf("%s",argv[0]); printf(" <inputfile>\n"); } else { char * filename = argv[1]; FILE * input = fopen(filename,'r'); process(input); fclose(filename); } return 0;
} </source>